First public version

2025-08-30 16:30:19 +02:00 · 2021-04-20 10:50:16 +02:00
commit 2e862f62ed
19 changed files with 1697 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1 @@
+.*
--- a/909BD.mp3
+++ b/909BD.mp3
--- a/909CH.mp3
+++ b/909CH.mp3
--- a/909OH.mp3
+++ b/909OH.mp3
--- a/909SD.mp3
+++ b/909SD.mp3
--- a/README.md
+++ b/README.md
@@ -0,0 +1,21 @@
+# The Endless Acid Banger
+
+An algorithmic human-computer techno jam
+
+![Screenshot](https://github.com/vitling/acid-banger/blob/main/preview.png?raw=true)
+
+Built in Typescript with the WebAudio API.
+
+Live version running at [www.vitling.xyz/toys/acid-banger](https://www.vitling.xyz/toys/acid-banger)
+
+
+## Support
+
+You can support my work by [Sponsoring me on GitHub](https://github.com/sponsors/vitling) or [buying](https://music.vitling.xyz) [my music](https://edgenetwork.bandcamp.com/album/edge001-spaceport-lounge-music)
+
+
+## License
+
+This work is licensed under a [Creative Commons Attribution 4.0 International License](http://creativecommons.org/licenses/by/4.0/)
+
+This means you can use the ideas and/or the code and/or the music output in derivative works, but you must give credit to the original source (ie. me and this project).
--- a/build.sh
+++ b/build.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+mkdir -p dist
+tsc -p .
+webpack ./js/app.js -o dist/ --mode production
+cp index.html *.wav ui.css preview.png dist
--- a/index.html
+++ b/index.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<!--Copyright 2021 David Whiting-->
+<!--This work is licensed under a Creative Commons Attribution 4.0 International License-->
+<!--https://creativecommons.org/licenses/by/4.0/-->
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>The Endless Acid Banger</title>
+    <script type="module" src="js/app.js"></script>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta property="og:title" content="vitling: The Endless Acid Banger" />
+    <meta property="og:type" content="music.song" />
+    <meta property="og:url" content="http://www.vitling.com/toys/acid-banger/" />
+    <meta property="og:image" content="http://www.vitling.com/toys/acid-banger/preview.png" />
+    <meta property="og:description" content="Algorithmic music experiement by Vitling" />
+    <meta property="music:musician" content="Vitling" />
+    <link rel="stylesheet" href="ui.css">
+</head>
+<body>
+<h2>The Endless Acid Banger</h2>
+<p>
+    The music you hear is generated in your browser by a randomised algorithm, below you can see the notes and parameters that are currently in use.
+    You can also interact with various parameters and buttons manually.
+    The green autopilot switches change how automatic playback is. Leave them on for a lean-back experience.
+    Buttons labelled ⟳ will generate new patterns.
+</p>
+<p>
+    The Endless Acid Banger was created by <a href="https://www.vitling.xyz">Vitling</a>.
+    If you want to support my work, please consider
+    <a href="https://music.vitling.xyz/album/long-walks-and-tough-talks">buying</a> <a href="https://edgenetwork.bandcamp.com/album/edge001-spaceport-lounge-music">my</a> <a href="https://midnight-people.bandcamp.com/album/destiny-ep">music</a> or
+    <a href="https://github.com/sponsors/vitling">sponsoring my GitHub</a>.
+</p>
+</body>
+</html>
--- a/preview.png
+++ b/preview.png
--- a/src/app.ts
+++ b/src/app.ts
@@ -0,0 +1,256 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+import {Clock, pressToStart} from "./boilerplate.js";
+import {Audio, AudioT} from './audio.js';
+import {NineOhGen, ThreeOhGen} from "./pattern.js";
+import {UI} from "./ui.js";
+import {
+    DrumPattern,
+    genericParameter,
+    NineOhMachine, NoteGenerator,
+    NumericParameter,
+    parameter,
+    Pattern, ProgramState,
+    ThreeOhMachine, trigger,
+    DelayUnit, ClockUnit,
+    AutoPilotUnit
+} from "./interface.js";
+
+
+function WanderingParameter(param: NumericParameter, scaleFactor = 1/400) {
+    const [min,max] = param.bounds;
+
+    let diff = 0.0;
+    let scale = scaleFactor * (max - min);
+    let touchCountdown = 0;
+
+    let previousValue = (min + max) / 2 ;
+
+    const step = () => {
+        if (previousValue != param.value) {
+            // Something else has touched this parameter
+            diff = 0;
+            previousValue = param.value;
+            touchCountdown = 200
+        } else  {
+            if (touchCountdown > 0) {
+                touchCountdown--;
+            }
+
+            if (touchCountdown < 100) {
+                diff *=  touchCountdown > 0 ? 0.8 : 0.98;
+                diff += (Math.random() - 0.5) * scale;
+                param.value += diff;
+
+
+                previousValue = param.value
+                if (param.value > min + 0.8 * (max - min)) {
+                    diff -= Math.random() * scale;
+                } else if (param.value < min + 0.2 * (max - min)) {
+                    diff += Math.random() * scale;
+                }
+            }
+        }
+    }
+
+    return {
+        step
+    }
+}
+
+function ThreeOhUnit(audio: AudioT, waveform: OscillatorType, output: AudioNode, gen: NoteGenerator, patternLength: number=16): ThreeOhMachine {
+    const synth = audio.ThreeOh(waveform, output);
+    const pattern = genericParameter<Pattern>("Pattern", []);
+    const newPattern = trigger("New Pattern Trigger", true);
+
+    gen.newNotes.subscribe(newNotes => {
+        if (newNotes == true) newPattern.value = true;
+    })
+
+    function step(index: number) {
+        if ((index === 0 && newPattern.value == true) || pattern.value.length == 0) {
+            pattern.value = gen.createPattern();
+            newPattern.value = false;
+        }
+
+        const slot = pattern.value[index % patternLength];
+        if (slot.note != "-") {
+            synth.noteOn(slot.note, slot.accent, slot.glide);
+        } else {
+            synth.noteOff();
+        }
+    }
+
+    const parameters = {
+        cutoff: parameter("Cutoff", [30,700],400),
+        resonance: parameter("Resonance", [1,30],15),
+        envMod: parameter("Env Mod", [0,8000], 4000),
+        decay: parameter("Decay", [0.1,0.9], 0.5)
+    };
+
+    parameters.cutoff.subscribe(v => synth.params.cutoff.value = v);
+    parameters.resonance.subscribe(v => synth.params.resonance.value = v);
+    parameters.envMod.subscribe(v => synth.params.envMod.value = v);
+    parameters.decay.subscribe(v => synth.params.decay.value = v);
+
+    return {
+        step,
+        pattern,
+        parameters,
+        newPattern
+    }
+}
+
+async function NineOhUnit(audio: AudioT): Promise<NineOhMachine> {
+    const drums = await audio.SamplerDrumMachine(["909BD.mp3","909OH.mp3","909CH.mp3","909SD.mp3"])
+    const pattern = genericParameter<DrumPattern>("Drum Pattern", []);
+    const mutes = [
+        genericParameter("Mute BD", false),
+        genericParameter("Mute OH", false),
+        genericParameter("Mute CH", false),
+        genericParameter("Mute SD", false)
+    ];
+    const newPattern = trigger("New Pattern Trigger", true);
+    const gen = NineOhGen();
+
+    function step(index: number) {
+        if ((index == 0 && newPattern.value == true) || pattern.value.length == 0) {
+            pattern.value = gen.createPatterns(true);
+            newPattern.value = false;
+        }
+        for (let i in pattern.value) {
+            const entry = pattern.value[i][index % pattern.value[i].length];
+            if (entry && !mutes[i].value) {
+                drums.triggers[i].play(entry);
+            }
+        }
+    }
+
+    return {
+        step,
+        pattern,
+        mutes,
+        newPattern
+    }
+}
+
+function DelayUnit(audio: AudioT): DelayUnit  {
+    const dryWet = parameter("Dry/Wet", [0,0.5], 0.5);
+    const feedback = parameter("Feedback", [0,0.9], 0.3);
+    const delayTime = parameter("Time", [0,2], 0.3);
+    const delay = audio.DelayInsert(delayTime.value, dryWet.value, feedback.value);
+    dryWet.subscribe(w => delay.wet.value = w);
+    feedback.subscribe(f => delay.feedback.value = f);
+    delayTime.subscribe(t => delay.delayTime.value = t);
+
+    return {
+        dryWet,
+        feedback,
+        delayTime,
+        inputNode: delay.in,
+    }
+}
+
+function AutoPilot(state: ProgramState): AutoPilotUnit {
+    const nextMeasure = parameter("upcomingMeasure", [0, Infinity],0);
+    const currentMeasure = parameter("measure", [0, Infinity], 0);
+    const patternEnabled = genericParameter("Alter Patterns", true);
+    const dialsEnabled = genericParameter("Twiddle With Knobs", true);
+    const mutesEnabled = genericParameter("Mute Drum Parts", true);
+    state.clock.currentStep.subscribe(step => {
+        if (step === 4) {
+            nextMeasure.value = nextMeasure.value + 1;
+        } else if (step === 15) { // slight hack to get mutes functioning as expected
+            currentMeasure.value = currentMeasure.value + 1;
+        }
+    });
+
+    nextMeasure.subscribe(measure => {
+        if (patternEnabled.value) {
+            if (measure % 64 === 0) {
+                if (Math.random() < 0.2) {
+                    state.gen.newNotes.value = true;
+                }
+            }
+            if (measure % 16 === 0) {
+                state.notes.forEach((n, i) => {
+                    if (Math.random() < 0.5) {
+                        n.newPattern.value = true;
+                    }
+                });
+                if (Math.random() < 0.3) {
+                    state.drums.newPattern.value = true;
+                }
+            }
+        }
+    })
+
+    currentMeasure.subscribe(measure => {
+        if (mutesEnabled.value) {
+            if (measure % 8 == 0) {
+                const drumMutes = [Math.random() < 0.2, Math.random() < 0.5, Math.random() < 0.5, Math.random() < 0.5];
+                state.drums.mutes[0].value = drumMutes[0];
+                state.drums.mutes[1].value = drumMutes[1];
+                state.drums.mutes[2].value = drumMutes[2];
+                state.drums.mutes[3].value = drumMutes[3];
+            }
+        }
+    })
+    const noteParams = state.notes.flatMap(x => Object.values(x.parameters))
+    const delayParams = [state.delay.feedback, state.delay.dryWet];
+
+    const wanderers = [...noteParams, ...delayParams].map(param => WanderingParameter(param));
+    window.setInterval(() => { if (dialsEnabled.value) wanderers.forEach(w => w.step());},100);
+
+
+    return {
+        switches: [
+            patternEnabled,
+            dialsEnabled,
+            mutesEnabled
+        ]
+    }
+}
+
+function ClockUnit(): ClockUnit {
+    const bpm = parameter("BPM", [70,200],142);
+    const currentStep = parameter("Current Step", [0,15],0);
+    const clockImpl = Clock(bpm.value, 4, 0.0);
+    bpm.subscribe(clockImpl.setBpm);
+    clockImpl.bind((time, step) => {
+        currentStep.value = step % 16;
+    })
+    return {
+        bpm,
+        currentStep
+    }
+}
+
+async function start() {
+    const audio = Audio();
+    const clock = ClockUnit();
+    const delay = DelayUnit(audio);
+    clock.bpm.subscribe(b => delay.delayTime.value = (3/4) * (60/b));
+
+    const gen = ThreeOhGen();
+    const programState: ProgramState = {
+        notes: [
+            ThreeOhUnit(audio, "sawtooth", delay.inputNode, gen),ThreeOhUnit(audio, "square", delay.inputNode, gen)
+        ],
+        drums: await NineOhUnit(audio),
+        gen,
+        delay,
+        clock
+    }
+
+    clock.currentStep.subscribe(step => [...programState.notes, programState.drums].forEach(d => d.step(step)));
+    const autoPilot = AutoPilot(programState);
+    const ui = UI(programState, autoPilot, audio.master.analyser);
+    document.body.append(ui);
+}
+
+pressToStart(start, "The Endless Acid Banger", "A collaboration between human and algorithm by Vitling");
--- a/src/audio.ts
+++ b/src/audio.ts
@@ -0,0 +1,340 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+import {biRnd} from "./math.js";
+
+export type Note = 'A' | 'A#' | 'B' | 'C' | 'C#' | 'D' | 'D#' | 'E' | 'F' | 'F#' | 'G' | 'G#';
+export type Octave = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8';
+export type FullNote = `${Note}${Octave}`
+
+const lookupTable: Map<Note, number> = new Map<Note, number>();
+const revLook: Map<number, Note> = new Map<number, Note>();
+(()=>{
+    function add(note: Note, n: number) {
+        lookupTable.set(note, n);
+        revLook.set(n, note);
+    }
+    add('A', 9);
+    add('A#', 10);
+    add('B', 11);
+    add('C', 0);
+    add('C#', 1);
+    add('D', 2);
+    add('D#', 3);
+    add('E', 4);
+    add('F', 5);
+    add('F#', 6);
+    add('G', 7);
+    add('G#', 8);
+})();
+
+
+export function textNoteToNumber(note: FullNote) {
+    const o: Octave = note.substring(note.length - 1) as Octave;
+    const n: Note = note.substring(0,note.length -1) as Note;
+
+    // @ts-ignore
+    return parseInt(o) * 12 + lookupTable.get(n) + 12;
+}
+
+function midiNoteToFrequency(noteNumber: number) {
+    return 440 * Math.pow(2, (noteNumber - 69) / 12);
+}
+
+export function midiNoteToText(note: number): FullNote {
+    const octave = Math.floor(note / 12);
+    const n = Math.floor(note % 12);
+    const noteName = revLook.get(n) as Note;
+    return `${noteName}${octave}` as FullNote;
+}
+
+export function pitch(note: FullNote | number) {
+    if (typeof(note) === 'number') {
+        return midiNoteToFrequency(note);
+    } else {
+        return midiNoteToFrequency(textNoteToNumber(note));
+    }
+}
+
+// @ts-ignore
+export function Audio(au: AudioContext = new (window.AudioContext || window.webkitAudioContext)()) {
+    function masterChannel() {
+        const gain = au.createGain();
+        gain.gain.value = 0.5;
+        const limiter = au.createDynamicsCompressor();
+        limiter.attack.value = 0.005;
+        limiter.release.value = 0.1;
+        limiter.ratio.value = 15.0;
+        limiter.knee.value = 0.0;
+        limiter.threshold.value = -0.5;
+
+        const analyser = au.createAnalyser();
+        analyser.fftSize = 2048;
+        limiter.connect(analyser);
+
+
+        gain.connect(limiter);
+        limiter.connect(au.destination);
+
+        return {
+            in: gain,
+            analyser
+        }
+    }
+
+    function constantSourceCompatible(): AudioNode & {offset: AudioParam, start: () => void} {
+        if (au.createConstantSource) {
+            return au.createConstantSource();
+        } else {
+            const src = au.createBufferSource();
+            src.buffer = au.createBuffer(1, 256, au.sampleRate);
+            const array = src.buffer.getChannelData(0);
+            for (let i = 0; i < array.length; i++) {
+                array[i] = 1.0;
+            }
+            const gain = au.createGain();
+            const offsetParam = gain.gain;
+            src.loop = true;
+            src.connect(gain);
+            return Object.assign(gain, {offset: offsetParam, start: () => src.start()});
+        }
+    }
+
+    function decodeAudioDataCompatible(audioData: ArrayBuffer): Promise<AudioBuffer> {
+        return new Promise((resolve, reject) => {
+            return au.decodeAudioData(audioData, resolve, reject);
+        });
+    }
+
+    const master = masterChannel();
+
+    function time(s: number) {
+        return new Promise<void>(resolve => {setTimeout(()=> resolve(), s * 1000)})
+    }
+
+    async function tone(pitch: number, attack: number, sustain: number, release:number, pan: number = 0.0, destination: AudioNode = master.in) {
+        const osc = au.createOscillator();
+        osc.type = "sawtooth";
+        osc.frequency.value = pitch;
+        osc.start();
+
+        const filter = au.createBiquadFilter();
+        filter.type = "lowpass";
+        filter.frequency.value = pitch * 4;
+        filter.Q.value = 5;
+
+        const gain = au.createGain();
+        gain.gain.value = 0.0;
+
+        const panner = au.createPanner();
+        panner.panningModel = "equalpower";
+        panner.setPosition(pan, 0, 1-Math.abs(pan));
+
+        osc.connect(filter);
+        filter.connect(gain);
+        gain.connect(panner);
+        panner.connect(destination);
+
+        gain.gain.linearRampToValueAtTime(0.1, au.currentTime + attack);
+
+        await time(sustain + attack);
+        gain.gain.setValueAtTime(0.1, au.currentTime);
+        gain.gain.linearRampToValueAtTime(0,au.currentTime + release);
+        filter.frequency.linearRampToValueAtTime(Math.max(pitch/2, 400), au.currentTime + release);
+
+        await time(release + 0.01);
+        osc.stop(au.currentTime);
+        panner.disconnect();
+    }
+
+    function SimpleToneSynth(attack: number, sustain: number, release:number, destination: AudioNode = master.in) {
+
+
+        function play(note: FullNote) {
+            tone(pitch(note), attack, sustain, release, biRnd(), destination);
+        }
+        return {
+            play
+        }
+    }
+
+    function DelayInsert(time: number, feedback: number, wet: number, destination: AudioNode = master.in) {
+        const delayNode = au.createDelay(1);
+        delayNode.delayTime.value = time;
+        const feedbackGain = au.createGain();
+        feedbackGain.gain.value = feedback;
+        delayNode.connect(feedbackGain);
+        feedbackGain.connect(delayNode);
+        const delayGain = au.createGain();
+        delayGain.gain.value = wet;
+        delayNode.connect(delayGain);
+        delayGain.connect(destination);
+        const synthOut = au.createGain();
+        synthOut.gain.value = 1.0;
+        synthOut.connect(delayNode);
+        synthOut.connect(destination);
+        return {
+            in: synthOut,
+            feedback: feedbackGain.gain,
+            wet: delayGain.gain,
+            delayTime: delayNode.delayTime
+        }
+    }
+
+    function ThreeOh(type: OscillatorType = "sawtooth", out: AudioNode = master.in) {
+        const filter = au.createBiquadFilter();
+        filter.type = "lowpass";
+        filter.Q.value = 20;
+        filter.frequency.value = 300;
+        const pResonance = filter.Q;
+        const pCutoff = filter.frequency;
+
+        const decayTimeNode = constantSourceCompatible();
+        decayTimeNode.start();
+        const pDecay = decayTimeNode.offset;
+
+        const env = constantSourceCompatible();
+        env.start();
+        env.offset.value = 0.0;
+
+        function trigger() {
+
+        }
+
+        const scaleNode = au.createGain();
+        scaleNode.gain.value = 4000;
+        const pEnvMod = scaleNode.gain;
+        env.connect(scaleNode);
+        scaleNode.connect(filter.detune);
+
+        const osc = au.createOscillator();
+        osc.type = type;
+
+        osc.frequency.value = 440;
+        osc.start();
+
+        const vca = au.createGain();
+        vca.gain.value = 0.0;
+
+        osc.connect(vca);
+        vca.connect(filter);
+        filter.connect(out);
+
+
+        function noteOn(note: FullNote, accent: boolean = false, glide: boolean = false) {
+            if (accent) {
+                env.offset.cancelScheduledValues(au.currentTime);
+                //env.offset.setTargetAtTime(1.0,au.currentTime, 0.001);
+                env.offset.setValueAtTime(1.0, au.currentTime);
+                env.offset.exponentialRampToValueAtTime(0.01, au.currentTime + pDecay.value/3);
+            } else {
+                env.offset.cancelScheduledValues(au.currentTime);
+                //env.offset.setTargetAtTime(1.0,au.currentTime, 0.001);
+                env.offset.setValueAtTime(1.0, au.currentTime);
+                env.offset.exponentialRampToValueAtTime(0.01, au.currentTime + pDecay.value);
+            }
+            osc.frequency.cancelScheduledValues(au.currentTime);
+            osc.frequency.setTargetAtTime(midiNoteToFrequency(textNoteToNumber(note)),au.currentTime, glide ? 0.02 : 0.002);
+            vca.gain.cancelScheduledValues(au.currentTime);
+            vca.gain.setValueAtTime(accent ? 0.2 : 0.15, au.currentTime);
+            //vca.gain.setTargetAtTime(accent ? 0.5 : 0.3,au.currentTime, 0.001);
+            //vca.gain.setValueAtTime(0.2, au.currentTime);
+            vca.gain.linearRampToValueAtTime(0.1, au.currentTime + 0.2);
+            trigger();
+        }
+
+        function noteOff() {
+            vca.gain.cancelScheduledValues(au.currentTime);
+            vca.gain.setTargetAtTime(0.0,au.currentTime,0.01);
+        }
+
+        return {
+            noteOn,
+            noteOff,
+            params: {
+                cutoff: pCutoff,
+                resonance: pResonance,
+                envMod: pEnvMod,
+                decay: pDecay
+            }
+        }
+    }
+
+    function kick(out: AudioNode = master.in) {
+        const osc = au.createOscillator();
+        osc.frequency.value = 400;
+        const gain = au.createGain();
+        gain.gain.value = 0.3;
+        osc.start();
+        osc.frequency.exponentialRampToValueAtTime(50, au.currentTime + 0.04);
+        gain.gain.setValueCurveAtTime([0.5,0.5,0.45,0.4,0.25,0.0], au.currentTime, 0.09);
+
+        osc.stop(au.currentTime + 0.1);
+        window.setTimeout(() => gain.disconnect(), 200);
+
+        osc.connect(gain);
+        gain.connect(out);
+    }
+
+    async function loadBuffer(filePath: string) {
+        const response = await fetch(filePath);
+        const arraybuffer = await response.arrayBuffer();
+
+        const audioBuffer = await decodeAudioDataCompatible(arraybuffer);
+        return audioBuffer;
+    }
+
+    async function Sampler(file: string) {
+        const sampleBuffer = await loadBuffer(file);
+        function play(gain: number = 0.4, decay: number = 1.0, out: AudioNode = master.in) {
+            const bufferSource = au.createBufferSource();
+            bufferSource.buffer = sampleBuffer;
+            bufferSource.loop = false;
+
+            const gainNode = au.createGain();
+            gainNode.gain.setValueAtTime(gain,au.currentTime);
+            gainNode.gain.linearRampToValueAtTime(0.0, au.currentTime + decay);
+
+            bufferSource.connect(gainNode);
+            gainNode.connect(out);
+            bufferSource.start(au.currentTime);
+        }
+        return {
+            play
+        }
+    }
+
+    async function SamplerDrumMachine(files: string[], out: AudioNode = master.in) {
+        const sum = au.createGain();
+        sum.gain.value = 1.0;
+        sum.connect(out);
+
+        const promisedMachines = files.map(Sampler)
+        const samplers = await Promise.all(promisedMachines);
+        const mapped = samplers.map(sampler => ({
+            play: (vel: number) => sampler.play(0.7 * vel, vel * 0.5, sum)
+        }));
+
+        return {
+            triggers: mapped
+        }
+    }
+
+
+    return {
+        tone,
+        SimpleToneSynth,
+        DelayInsert,
+        ThreeOh,
+        kick,
+        Sampler,
+        SamplerDrumMachine,
+        master,
+        context: au
+    }
+}
+
+export type AudioT = ReturnType<typeof Audio>
--- a/src/boilerplate.ts
+++ b/src/boilerplate.ts
@@ -0,0 +1,93 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+export function pressToStart(fn: () => void, title: string, description: string, callToAction: string = "Click, tap or press any key to start") {
+
+    const button = document.createElement("button");
+    button.id="_start_button";
+    const introText = document.createElement("div");
+    introText.id = "_intro_text";
+    button.append(introText);
+    introText.innerHTML = title + "<br><br>" + description + "<br><br>" + callToAction;
+
+    document.head.insertAdjacentHTML("beforeend", `
+    <style>
+        body {
+            height: 95vh;  margin: 0; padding: 0; 
+        }
+        #${button.id} {
+            width: 100%;
+            height: 100%;
+            display: block;
+            position: absolute;
+            top: 0;
+            left: 0;
+            z-index: 50;
+            color:grey;
+            background-color: black;
+        }
+        
+        #${introText.id} {
+            max-width: 640px;
+            font-size: 1.5em;
+            margin-left: auto;
+            margin-right: auto;
+            text-align:left;
+            font-family: monospace;
+        }
+    </style>
+    `);
+    document.body.append(button);
+
+    let started = false;
+    function handleStartAction() {
+        if (!started) {
+            started = true;
+            fn();
+            button.style.display = "none";
+        }
+    }
+    button.addEventListener("click", handleStartAction);
+    window.addEventListener("keydown", handleStartAction);
+
+}
+
+export function repeat(seconds: number, fn: (time: number, step: number) => void) {
+    let time = new Date().getTime();
+    let n = 0;
+    function step() {
+        const t = new Date().getTime() - time;
+        fn(t, n);
+        n++;
+    }
+
+    step();
+    window.setInterval(step, seconds * 1000);
+}
+
+export function Clock(bpm: number, subdivision: number =4, shuffle: number = 0) {
+    let currentBpm = bpm;
+    let fn = (time: number, step: number) => {};
+    let time = new Date().getTime();
+    let n = 0;
+    function bind(newFn: (time: number, step: number) => void) {
+        fn = newFn;
+    }
+    function step() {
+        const t = new Date().getTime() - time;
+        fn(t, n);
+        const shuffleFactor = n % 2 == 0 ? 1 + shuffle : 1 - shuffle;
+        n++;
+
+        window.setTimeout(step, shuffleFactor * (60000 / currentBpm) / subdivision);
+    }
+
+    window.setTimeout(step, (60000 / bpm) / subdivision);
+    return {
+        bind,
+        setBpm: (bpm: number) => currentBpm = bpm
+    }
+}
--- a/src/dial.ts
+++ b/src/dial.ts
@@ -0,0 +1,122 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+function clamp(n: number): number {
+    return n < 0 ? 0 : n > 1 ? 1 : n;
+}
+
+export function Dial(bounds: [number, number], text?: string, dialColor: string = "red", textColor: string="white"){
+    const element = document.createElement("canvas");
+    element.classList.add("dial");
+    const w = element.width = 70;
+    const h = element.height = 50;
+    const size = 20;
+    const g = element.getContext("2d") as CanvasRenderingContext2D;
+    let normalizedValue = 0.5;
+    let previousNormalisedValue = 0.5;
+    let fadeCounter = 0;
+    let fadeTimerHandler: number | null = null;
+
+    function paint() {
+        g.clearRect(0,0,w,h);
+
+        const arc = [Math.PI * 0.8, Math.PI * 2.2];
+        g.strokeStyle = dialColor;
+        g.lineWidth = 2;
+        g.beginPath();
+        g.arc(w/2, h/2, size, arc[0], arc[1]);
+        g.stroke();
+
+        g.lineWidth = w / 8;
+        const pos = arc[0] + normalizedValue * (arc[1] - arc[0]);
+        g.beginPath();
+        g.arc(w/2, h/2, size, pos - 0.2, pos + 0.2);
+        g.stroke();
+
+        if (fadeCounter > 0) {
+            g.strokeStyle = "rgba(0,255,0," + clamp(fadeCounter/10) + ")";
+            g.lineWidth = w / 8;
+            const pos = arc[0] + normalizedValue * (arc[1] - arc[0]);
+            g.beginPath();
+            g.arc(w/2, h/2, size, pos - 0.2, pos + 0.2);
+            g.stroke();
+        }
+
+        if (text) {
+            g.fillStyle = textColor;
+            g.font = "10px Orbitron";
+            const tw = g.measureText(text).width;
+            g.fillText(text, w/2 - tw / 2, h/2 + size);
+        }
+    }
+
+    function fade(frames: number) {
+        if (fadeTimerHandler) window.clearInterval(fadeTimerHandler);
+        fadeCounter = Math.min(frames, 10);
+        fadeTimerHandler = window.setInterval(() => {
+            fadeCounter--;
+            paint()
+        }, 100);
+    }
+
+
+    function normalise(v: number) {
+        return (v - bounds[0]) / (bounds[1] - bounds[0]);
+    }
+
+    function denormalise(n: number) {
+        return bounds[0] + (bounds[1] - bounds[0]) * n;
+    }
+
+    function setValue(n: number) {
+        normalizedValue = normalise(n);
+        paint();
+        if (Math.abs(normalizedValue - previousNormalisedValue) > 0.002) {
+            fade(4 + Math.floor(Math.abs(normalizedValue - previousNormalisedValue) / 0.001));
+        }
+        previousNormalisedValue = normalizedValue;
+    }
+
+    function getValue(): number {
+        return denormalise(normalizedValue);
+    }
+
+    const state = {isDragging: false, handler: [(v: number) => {}]};
+
+
+    function bind(h: (v: number) => void) {
+        state.handler.push(h);
+    }
+
+    element.addEventListener("mousedown", (e) => {
+        state.isDragging = true;
+    });
+
+    window.addEventListener("mousemove", (e) => {
+        if (state.isDragging) {
+            const delta = (e.movementX - e.movementY)/100;
+            normalizedValue = clamp(normalizedValue+delta);
+            const actualValue = denormalise(normalizedValue);
+            setValue(actualValue);
+            state.handler.forEach(h => h(actualValue));
+        }
+    })
+
+    window.addEventListener("mouseup", (e) => {
+        state.isDragging = false;
+    })
+
+    paint();
+
+
+    return {
+        element,
+        get value(): number { return getValue(); },
+        set value(v: number) { setValue(v); },
+        bind
+    };
+}
+export type DialT = ReturnType<typeof Dial>
--- a/src/interface.ts
+++ b/src/interface.ts
@@ -0,0 +1,111 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+import {FullNote} from "./audio.js";
+export type Slot = {
+    note: FullNote | "-";
+    accent: boolean,
+    glide: boolean
+}
+
+export type Pattern = Slot[]
+
+export type DrumPattern = number[][];
+type ParameterCallback<T> = (v: T) => any;
+
+export type GeneralisedParameter<T> = {
+    value: T,
+    name: string,
+    subscribe: (callback: ParameterCallback<T>) => any
+}
+
+export type Trigger = GeneralisedParameter<boolean>
+
+export type NumericParameter = GeneralisedParameter<number> & {
+    bounds: [number,number]
+}
+
+export type PatternParameter = GeneralisedParameter<Pattern>;
+
+export type ThreeOhMachine = {
+    pattern: GeneralisedParameter<Pattern>,
+    newPattern: Trigger
+    step: (step: number) => void
+    parameters: {
+        cutoff: NumericParameter,
+        resonance: NumericParameter,
+        envMod: NumericParameter,
+        decay: NumericParameter
+    }
+}
+
+export type NineOhMachine = {
+    pattern: GeneralisedParameter<DrumPattern>,
+    newPattern: Trigger,
+    mutes: GeneralisedParameter<boolean>[],
+    step: (step: number) => void
+}
+
+export type NoteGenerator = {
+    noteSet: GeneralisedParameter<FullNote[]>
+    newNotes: Trigger
+    createPattern: () => Pattern
+}
+
+export type DelayUnit = {
+    dryWet: NumericParameter,
+    feedback: NumericParameter,
+    delayTime: NumericParameter,
+    inputNode: AudioNode,
+    // outputNode: AudioNode
+}
+
+
+export type ClockUnit = {
+    currentStep: NumericParameter,
+    bpm: NumericParameter
+}
+
+export type AutoPilotUnit = {
+    switches: GeneralisedParameter<boolean>[]
+}
+
+export function genericParameter<T>(name: string, value: T): GeneralisedParameter<T> {
+    let listeners: ParameterCallback<T>[] = [];
+    const state = {value};
+    function subscribe(callback: ParameterCallback<T>) {
+        callback(state.value);
+        listeners.push(callback);
+    }
+
+    function publish() {
+        for (let l of listeners) {
+            l(state.value);
+        }
+    }
+    return {
+        name,
+        subscribe,
+        get value() { return state.value; },
+        set value(v: T) { state.value = v; publish(); }
+    }
+}
+
+export function trigger(name: string, value: boolean = false): Trigger {
+    return genericParameter(name, value);
+}
+
+export function parameter(name: string, bounds: [number, number], value: number): NumericParameter {
+    return Object.assign(genericParameter<number>(name, value), {bounds});
+}
+
+export type ProgramState = {
+    notes: ThreeOhMachine[],
+    drums: NineOhMachine,
+    gen: NoteGenerator,
+    delay: DelayUnit
+    clock: ClockUnit
+}
--- a/src/math.ts
+++ b/src/math.ts
@@ -0,0 +1,18 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+export function rndInt(maxExcl: number): number {
+    return Math.floor(Math.random() * (maxExcl-0.01));
+}
+
+export function biRnd(): number {
+    return Math.random() * 2 - 1;
+}
+
+export function choose<T>(array: T[]):T {
+    return array[rndInt(array.length)];
+}
+
--- a/src/pattern.ts
+++ b/src/pattern.ts
@@ -0,0 +1,153 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+import {FullNote, midiNoteToText} from "./audio.js";
+import {choose, rndInt} from "./math.js";
+import {
+    GeneralisedParameter,
+    genericParameter,
+    NoteGenerator,
+    parameter,
+    Pattern,
+    Slot,
+    trigger,
+    Trigger
+} from "./interface.js";
+
+
+export function ThreeOhGen(): NoteGenerator {
+
+    let noteSet: GeneralisedParameter<FullNote[]> = genericParameter("note set", ['C1']);
+    let newNotes: Trigger = trigger("new note set", true);
+    const density = 1.0;
+
+    const offsetChoices = [
+        [0,0,12,24,27],
+        [0,0,0,12,10,19,26,27],
+        [0,1,7,10,12,13],
+        [0],
+        [0,0,0,12],
+        [0,0,12,14,15,19],
+        [0,0,0,0,12,13,16,19,22,24,25],
+        [0,0,0,7,12,15,17,20,24],
+    ];
+
+    function changeNotes() {
+        const root = rndInt(15) + 16;
+        const offsets: number[] = choose(offsetChoices);
+        noteSet.value = offsets.map(o => midiNoteToText(o + root));
+    }
+
+    function createPattern(): Pattern {
+        if (newNotes.value == true) {
+            changeNotes();
+            newNotes.value = false;
+        }
+        const pattern: Slot[] = [];
+
+        for (let i = 0; i < 16; i++) {
+            const chance = density * (i % 4 === 0 ? 0.6 : (i % 3 === 0 ? 0.5 : (i % 2 === 0 ? 0.3 : 0.1)));
+            if (Math.random() < chance) {
+                pattern.push({
+                    note: choose(noteSet.value),
+                    accent: Math.random() < 0.3,
+                    glide: Math.random() < 0.1
+                })
+            } else {
+                pattern.push({
+                    note: "-",
+                    accent: false,
+                    glide: false
+                })
+            }
+        }
+
+        return pattern;
+    }
+    return {
+        createPattern,
+        newNotes,
+        noteSet
+    }
+}
+
+export function NineOhGen() {
+    function createPatterns(full: boolean = false) {
+        const kickPattern: number[] = new Array(16);
+        const ohPattern: number[] = new Array(16);
+        const chPattern: number[] = new Array(16);
+        const sdPattern: number[] = new Array(16);
+        const kickMode: string = choose(["electro", "fourfloor"]);
+        const hatMode: string = choose(["offbeats", "closed", full ? "offbeats" : "none"]);
+        const snareMode: string = choose(["backbeat","skip", full ? "backbeat" : "none"]);
+
+        if (kickMode == "fourfloor") {
+            for (let i = 0; i < 16; i++) {
+                if (i % 4 == 0) {
+                    kickPattern[i] = 0.9;
+                } else if (i % 2 == 0 && Math.random() < 0.1) {
+                    kickPattern[i] = 0.6;
+                }
+            }
+        } else if (kickMode == "electro") {
+            for (let i = 0; i < 16; i++) {
+                if (i == 0) {
+                    kickPattern[i] = 1;
+                } else if (i % 2 == 0 && i % 8 != 4 && Math.random() < 0.5) {
+                    kickPattern[i] = Math.random() * 0.9;
+                } else if (Math.random() < 0.05) {
+                    kickPattern[i] = Math.random() * 0.9;
+                }
+            }
+        }
+
+        if (snareMode == "backbeat") {
+            for (let i = 0; i < 16; i++) {
+                if (i % 8 === 4) {
+                    sdPattern[i] = 1;
+                }
+            }
+        } else if (snareMode == "skip") {
+            for (let i = 0; i < 16; i++) {
+                if (i % 8 === 3 || i % 8 === 6) {
+                    sdPattern[i] = 0.6 + Math.random() * 0.4;
+                } else if (i % 2 === 0 && Math.random() < 0.2) {
+                    sdPattern[i] = 0.4 + Math.random() * 0.2;
+                } else if (Math.random() < 0.1) {
+                    sdPattern[i] = 0.2 + Math.random() * 0.2;
+                }
+            }
+        }
+
+        if (hatMode == "offbeats") {
+            for (let i = 0; i < 16; i++) {
+                if (i % 4 == 2) {
+                    ohPattern[i] = 0.4;
+                } else if (Math.random() < 0.3) {
+                    if (Math.random() < 0.5) {
+                        chPattern[i] = Math.random() * 0.2;
+                    } else {
+                        ohPattern[i] = Math.random() * 0.2;
+                    }
+                }
+
+            }
+        } else if (hatMode == "closed") {
+            for (let i = 0; i < 16; i++) {
+                if (i % 2 === 0) {
+                    chPattern[i] = 0.4;
+                } else if (Math.random() < 0.5) {
+                    chPattern[i] = Math.random() * 0.3;
+                }
+
+            }
+        }
+        return [kickPattern,ohPattern,chPattern,sdPattern]
+    }
+    return {
+        createPatterns
+    }
+}
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -0,0 +1,335 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+import {
+    DelayUnit,
+    DrumPattern,
+    GeneralisedParameter, ClockUnit, NineOhMachine, NoteGenerator,
+    NumericParameter,
+    PatternParameter, ProgramState,
+    ThreeOhMachine, Trigger, AutoPilotUnit
+} from "./interface.js";
+import {textNoteToNumber} from "./audio.js";
+import {Dial} from "./dial.js";
+
+const defaultColors = {
+    bg: "#222266",
+    note: "#88aacc",
+    accent: "#AA88CC",
+    glide: "#CCAA88",
+    text: "#CCCCFF",
+    highlight: "rgba(255,255,255,0.2)",
+    grid: "rgba(255,255,255,0.2)",
+    dial: "#AA88CC"
+}
+type ColorScheme = { [color in keyof typeof defaultColors]: string; };
+
+
+function DialSet(parameters: {[key: string]: NumericParameter} | NumericParameter[], ...classes: string[]) {
+    const params = Array.isArray(parameters) ? parameters : Object.keys(parameters).map(k => parameters[k]);
+
+    const container = document.createElement("div");
+    container.classList.add("params", ...classes);
+
+    params.forEach(param => {
+        //const param = parameters[p];
+        const dial = Dial(param.bounds, param.name, defaultColors.dial, defaultColors.text);
+
+        // Change the parameter if we move the dial
+        dial.bind(v => { param.value = v });
+
+        // Move the dial if the parameter changes elsewhere
+        param.subscribe(v => dial.value = v);
+
+        container.append(dial.element);
+    })
+
+    return container;
+}
+
+function triggerButton(target: Trigger) {
+    const but = document.createElement("button");
+    but.classList.add("trigger-button")
+    but.innerText = "⟳";
+
+    target.subscribe(v => {
+        if (v) but.classList.add("waiting"); else but.classList.remove("waiting");
+    });
+
+    but.addEventListener("click", function () {
+        target.value = true;
+    })
+
+    return but;
+}
+
+function toggleButton(param: GeneralisedParameter<boolean>, ...classes: string[]) {
+    const button = document.createElement("button");
+    button.classList.add(...classes);
+    button.innerText = param.name;
+    button.addEventListener("click", () => param.value = !param.value);
+    param.subscribe(v => {
+        if (v) {
+            button.classList.add("on");
+            button.classList.remove("off");
+        } else {
+            button.classList.add("off");
+            button.classList.remove("on");
+        }
+    })
+    return button;
+}
+
+function label(text: string) {
+    const element = document.createElement("div");
+    element.classList.add("label");
+    element.innerText = text;
+    return element;
+}
+
+function machine(...contents: HTMLElement[]) {
+    const element = document.createElement("div");
+    element.classList.add("machine");
+    element.append(...contents);
+    return element
+}
+
+function controlGroup(label: HTMLElement, content: HTMLElement, ...classes: string[]) {
+    const element = document.createElement("div");
+    element.classList.add("control-group", ...classes);
+    element.append(label, content);
+    return element
+}
+
+function controls(...contents: HTMLElement[]) {
+    const element = document.createElement("div");
+    element.classList.add("controls");
+    element.append(...contents);
+    return element
+}
+
+function group(...contents: HTMLElement[]) {
+    const element = document.createElement("div");
+    element.classList.add("group");
+    element.append(...contents);
+    return element;
+}
+
+
+function PatternDisplay(patternParam: PatternParameter, stepParam: NumericParameter,  colors: ColorScheme = defaultColors) {
+    const canvas = document.createElement("canvas");
+    canvas.classList.add("pattern");
+    function repaint() {
+        const pattern = patternParam.value;
+        const w = canvas.width = canvas.clientWidth;
+        const h = canvas.height = 200;
+        const vScale = h / 50;
+        const g = canvas.getContext("2d") as CanvasRenderingContext2D;
+
+        g.font = "10px Orbitron";
+
+        g.fillStyle = colors.bg;
+        g.fillRect(0, 0, w, h);
+
+        g.strokeStyle = colors.grid;
+        for (let i = 0; i < pattern.length; i++) {
+            const x = w * i / pattern.length;
+            g.beginPath();
+            g.moveTo(x, 0);
+            g.lineTo(x, h);
+            g.stroke();
+        }
+        for (let i = 0; i < 80; i++) {
+            const y = h - (i * vScale);
+            g.beginPath();
+            g.moveTo(0, y);
+            g.lineTo(w, y);
+            g.stroke();
+        }
+
+        for (let i = 0; i < pattern.length; i++) {
+            const s = pattern[i];
+            if (s.note === "-") {
+            } else {
+                const n = textNoteToNumber(s.note) - 24;
+                const x = w * i / pattern.length;
+                const y = h - (n * vScale);
+                const bw = w / pattern.length;
+                const bh = 5;
+
+                g.fillStyle = s.glide ? colors.glide : (s.accent ? colors.accent : colors.note);
+                g.fillRect(x, y, bw, bh);
+
+                g.fillStyle = colors.text;
+                const xt = (x + bw / 2) - g.measureText(s.note).width / 2;
+                g.fillText(s.note, xt, y);
+            }
+        }
+
+        g.fillStyle = colors.highlight;
+        g.fillRect(w * stepParam.value / pattern.length, 0, w / pattern.length, h);
+    }
+
+    patternParam.subscribe(repaint);
+    stepParam.subscribe(repaint);
+
+    return canvas;
+}
+
+function DrumDisplay(pattern: GeneralisedParameter<DrumPattern>, mutes: GeneralisedParameter<boolean>[], stepParam: NumericParameter, colors: ColorScheme = defaultColors) {
+    const canvas = document.createElement("canvas");
+    canvas.classList.add("pattern");
+
+    function repaint() {
+        const w = canvas.width = canvas.clientWidth;
+        const h = canvas.height = 100;
+        const g = canvas.getContext("2d") as CanvasRenderingContext2D;
+        g.fillStyle = colors.bg;
+        g.fillRect(0, 0, w, h);
+
+        for (let i = 0; i < 16; i++) {
+            const x = w * i / 16;
+            for (let p = 0; p < pattern.value.length; p++) {
+                const y = (p / pattern.value.length) * h;
+                if (pattern.value[p][i]) {
+                    if (mutes[p].value) {
+                        g.fillStyle = "rgba(128,0,0,0.4)";
+                    } else {
+                        g.fillStyle = "rgba(136,170,204," + pattern.value[p][i] + ")";
+                    }
+                    g.fillRect(x, y, w / 16, h / pattern.value.length);
+                }
+            }
+        }
+
+        g.fillStyle = colors.highlight;
+        g.fillRect(w * stepParam.value / 16, 0, w / 16, h);
+    }
+
+    pattern.subscribe(repaint);
+    stepParam.subscribe(repaint);
+
+    return canvas;
+}
+
+
+
+function NoteGen(noteGenerator: NoteGenerator) {
+    const currentNotes = document.createElement("div");
+    currentNotes.classList.add("parameter-controlled", "notegen-note-display");
+    noteGenerator.noteSet.subscribe(notes => {
+        currentNotes.innerText = notes.join(", ");
+    })
+
+    return controlGroup(
+        label("Notegen"),
+        group(
+            triggerButton(noteGenerator.newNotes),
+            currentNotes
+        ),
+        "notegen-box"
+    )
+}
+
+function Mutes(params: GeneralisedParameter<boolean>[]) {
+    const container = document.createElement("div");
+    container.classList.add("mutes");
+
+    container.append(...params.map(p => toggleButton(p)));
+    return container;
+}
+
+function DelayControls(delayUnit: DelayUnit) {
+    const controls = DialSet([delayUnit.dryWet, delayUnit.feedback]);
+    controls.classList.add("horizontal");
+
+    return controlGroup(
+        label("Delay"),
+        controls,
+    )
+}
+
+
+function AutopilotControls(autoPilot: AutoPilotUnit) {
+    return controlGroup(
+        label("Autopilot"),
+        group(
+            ...autoPilot.switches.map(p => toggleButton(p, "autopilot-button"))
+        )
+    )
+}
+
+function AudioMeter(analyser: AnalyserNode) {
+    const canvas = document.createElement("canvas");
+    canvas.style.width = "100%";
+    let w = canvas.width = 200;
+    const h = canvas.height = 100;
+    const g = canvas.getContext("2d") as CanvasRenderingContext2D;
+
+    const output = new Uint8Array(analyser.fftSize);
+
+    function draw() {
+        //w = canvas.width = canvas.clientWidth;
+        analyser.getByteTimeDomainData(output);
+
+        g.clearRect(0,0,w,h);
+        g.strokeStyle = "white";
+        g.beginPath();
+        g.moveTo(0,h/2);
+        for (let i =0 ; i < output.length; i++) {
+            const v = (output[i] / 128) - 1;
+            g.lineTo(w * i/output.length, h/2 + (1.5 * v* h/2));
+        }
+
+        g.stroke();
+        window.requestAnimationFrame(draw);
+    }
+    window.requestAnimationFrame(draw);
+
+    return canvas;
+}
+
+
+export function UI(state: ProgramState, autoPilot: AutoPilotUnit, analyser: AnalyserNode) {
+    const ui = document.createElement("div");
+    ui.id = "ui";
+
+    const otherControls = controls(
+        AutopilotControls(autoPilot),
+        NoteGen(state.gen),
+        DelayControls(state.delay),
+        controlGroup(label("Clock"), DialSet([state.clock.bpm], "horizontal")),
+        controlGroup(label("Meter"), group(AudioMeter(analyser)), "meter")
+    )
+
+
+
+    const machineContainer = document.createElement("div");
+    machineContainer.classList.add("machines");
+
+    const noteMachines = state.notes.map((n, i) => machine(
+        label("303-0" + (i+1)),
+        group(
+            triggerButton(n.newPattern),
+            PatternDisplay(n.pattern, state.clock.currentStep),
+            DialSet(n.parameters)
+        )
+    ));
+
+    const drumMachine = machine(
+        label("909-XX"),
+        group(
+            triggerButton(state.drums.newPattern),
+            DrumDisplay(state.drums.pattern, state.drums.mutes, state.clock.currentStep),
+            Mutes(state.drums.mutes)
+        )
+    )
+
+    machineContainer.append(...noteMachines, drumMachine)
+    ui.append(machineContainer, otherControls);
+
+    return ui;
+}
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "module": "es2015",
+    "target": "es6",
+    "lib": ["dom", "esnext"],
+    "sourceMap": true,
+    "outDir": "./js",
+    "strict": true
+  },
+  "compileOnSave": true,
+  "include": [
+    "src/**/*"
+  ]
+}
--- a/ui.css
+++ b/ui.css
@@ -0,0 +1,193 @@
+/*
+  Copyright 2021 David Whiting
+  This work is licensed under a Creative Commons Attribution 4.0 International License
+  https://creativecommons.org/licenses/by/4.0/
+*/
+
+@import url('https://fonts.googleapis.com/css2?family=Orbitron&display=swap');
+
+body {
+    background-color: #111;
+    color:white;
+    font-family: Orbitron, monospace;
+}
+
+#ui {
+    max-width: 1200px;
+    margin-left: auto;
+    margin-right: auto;
+
+}
+
+p {
+    max-width: 1200px;
+    margin-left: auto;
+    margin-right:auto;
+    font-family: monospace;
+}
+
+a {
+    color:white;
+}
+
+@media (max-width: 500px) {
+    p {
+        font-size: 0.8em;
+    }
+}
+
+.machine,.control-group {
+
+    background-color: black;
+    display: grid;
+    grid-template-columns: 20px auto;
+    border: 1px solid #444444;
+    margin:5px;
+}
+
+.label {
+    writing-mode: vertical-rl;
+    transform: rotate(180deg);
+    text-align: center;
+    /* left because we're 180 rotated */
+    border-left: 1px solid #444444;
+}
+
+.machine .group {
+    display: grid;
+    grid-template-columns: 25px auto 70px;
+}
+
+.controls {
+    display: flex;
+    flex-wrap: wrap;
+}
+
+.control-group {
+    height: 100px;
+}
+
+.control-group .group {
+    display: flex;
+    flex-direction: column;
+    align-items: stretch;
+}
+
+.control-group .group button {
+    flex-grow: 1;
+}
+
+.pattern {
+    width:100%;
+    height: 200px;
+    /*min-height: 150px;*/
+    /*border-right:1px solid rgba(255,255,255,0.3);*/
+}
+
+button {
+    color:white;
+    background-color: #111;
+    border: 1px solid #444;
+    text-align: center;
+    cursor: pointer;
+    font-family: Orbitron, monospace
+}
+
+button:hover {
+    background-color: #222;
+}
+
+.dial {
+    display: block;
+}
+.mutes button {
+    height: 50px;
+    display: block;
+}
+
+.mutes .on {
+    background-color: #770000;
+}
+
+.trigger-button {
+    font-size:20px;
+    padding:0;
+    text-align: center;
+}
+
+.params.horizontal .dial {
+  display: inline-block;
+}
+
+.control-group .params {
+    height: 50px;
+    margin-top: auto;
+    margin-bottom: auto;
+    text-align: center;
+}
+.control-group {
+    flex-grow: 1;
+}
+
+.meter canvas {
+    object-fit: fill;
+    height: 100px;
+    width:100px;
+}
+
+
+@keyframes wait-animate {
+    0% { background-color: black }
+    50% { background-color: red }
+    100% { background-color: black }
+}
+
+button.waiting {
+    background-color: red;
+    animation: wait-animate 0.2s infinite;
+}
+
+.parameter-controlled {
+    background-color: #222266;
+}
+
+
+.notegen-note-display {
+    width: 200px;
+    height: 50px;
+    margin-left: auto;
+    margin-right: auto;
+    padding:5px;
+}
+.controls button {
+    width: 100%;
+}
+
+@keyframes autopilot-animate {
+    0% { background-color: #113311 }
+    50% { background-color: green }
+    100% { background-color: #113311 }
+}
+/*@keyframes autopilot-border-animate {*/
+/*    0% { border: 1px solid #444 }*/
+/*    50% { border: 1px solid #494 }*/
+/*    100% { border: 1px solid #444 }*/
+/*}*/
+
+.autopilot-button.on {
+    animation: autopilot-animate 2s infinite;
+}
+
+
+h2 {
+    text-align: center;
+    font-size:1.5em;
+}
+
+/*@media (max-width: 640px) {*/
+/*    h2 {*/
+/*        font-size: 1.2em;*/
+/*    }*/
+/*}*/
+
+