41:null 42:["$","title",null,{"children":"Scale Triangle Tool | Florian Martin | Observable"}] 48:Tb57,audioSrc = { // 1. Setup Parameters const rootFreq = 220.0; const sampleRate = 44100; const noteDuration = 0.5; const numSamples = Math.floor(sampleRate * noteDuration); // (Assuming these are defined in your other Observable cells; mock values included for demonstration) // const edo = 12; // const scaleSteps = [0, 2, 4, 5, 7, 9, 11, 12]; // 2. Calculate Scale Frequencies const scaleFrequencies = [...scale, edo].map(n => rootFreq * Math.pow(2, n / edo)); // 3. Create Fade Envelope const fadeLen = Math.floor(sampleRate * 0.05); const envelope = new Float32Array(numSamples).fill(1.0); for (let i = 0; i < fadeLen; i++) { const factor = i / (fadeLen - 1); envelope[i] = factor; // Fade in envelope[numSamples - 1 - i] = factor; // Fade out } // 4. Generate Audio Samples const totalSamples = scaleFrequencies.length * numSamples; const fullWave = new Float32Array(totalSamples); scaleFrequencies.forEach((f, noteIdx) => { for (let i = 0; i < numSamples; i++) { const t = i / sampleRate; const sampleValue = 0.8 * Math.sin(2 * Math.PI * f * t) * envelope[i]; fullWave[noteIdx * numSamples + i] = sampleValue; } }); // 5. Construct WAV File Buffer const buffer = new ArrayBuffer(44 + totalSamples * 2); const view = new DataView(buffer); /* RIFF identifier */ writeString(view, 0, 'RIFF'); /* file length */ view.setUint32(4, 36 + totalSamples * 2, true); /* RIFF type */ writeString(view, 8, 'WAVE'); /* format chunk identifier */ writeString(view, 12, 'fmt '); /* format chunk length */ view.setUint32(16, 16, true); /* sample format (raw PCM) */ view.setUint16(20, 1, true); /* channel count */ view.setUint16(22, 1, true); /* sample rate */ view.setUint32(24, sampleRate, true); /* byte rate (sample rate * block align) */ view.setUint32(28, sampleRate * 2, true); /* block align (channel count * bytes per sample) */ view.setUint16(32, 2, true); /* bits per sample */ view.setUint16(34, 16, true); /* data chunk identifier */ writeString(view, 36, 'data'); /* data chunk length */ view.setUint32(40, totalSamples * 2, true); // Write PCM audio samples let offset = 44; for (let i = 0; i < totalSamples; i++) { const sample = Math.max(-1.0, Math.min(1.0, fullWave[i])); view.setInt16(offset, sample < 0 ? sample * 0x8000 : sample * 0x7FFF, true); offset += 2; } // 6. Convert to Object URL (Cleaner and faster than Base64 string manipulation in browsers) const blob = new Blob([buffer], { type: 'audio/wav' }); const audioSrc = URL.createObjectURL(blob); // Helper function to write ASCII strings into the DataView function writeString(view, offset, string) { for (let i = 0; i < string.length; i++) { view.setUint8(offset + i, string.charCodeAt(i)); } } return audioSrc }49:[] 46:{"id":"c01d2c969981164f","slug":"scale-triangle-tool","title":"Scale Triangle Tool","thumbnail":"e3a697cb78761fe4324dd0008a635def33c47ef97d3b5b7c48be13a81e23a902","access_level":"public","create_time":"$D2026-06-11T18:43:00.238Z","update_time":"$D2026-06-11T19:34:39.009Z","view_time":null,"first_public_time":"$D2026-06-11T19:13:58.714Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"6742dab86d1cbe69","login":"florianfmmartin","name":"Florian Martin","avatar_url":"https://avatars-next.observableusercontent.com/4932bc5120778597fc7db7ada5d9a2b364594b7d6c5893825883d60871c0f50b","tier":"starter_2024","bio":"","following":false},"version":83,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"bd567eaa45b63b82","login":"florianfmmartin","name":"Florian Martin","avatar_url":"https://avatars-next.observableusercontent.com/4932bc5120778597fc7db7ada5d9a2b364594b7d6c5893825883d60871c0f50b","tier":null,"bio":"","following":false}],"members":[{"type":"individual","id":"bd567eaa45b63b82","login":"florianfmmartin","name":"Florian Martin","avatar_url":"https://avatars-next.observableusercontent.com/4932bc5120778597fc7db7ada5d9a2b364594b7d6c5893825883d60871c0f50b","tier":null,"role":"editor"},{"type":"team","id":"6742dab86d1cbe69","login":"florianfmmartin","name":"Florian Martin","avatar_url":"https://avatars-next.observableusercontent.com/4932bc5120778597fc7db7ada5d9a2b364594b7d6c5893825883d60871c0f50b","tier":"starter_2024","role":"viewer"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Scale Triangle Tool","cells":[{"id":0,"value":"# Scale Triangle Tool\nInspired by [The Color Tree](https://colortreemusic.com/)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":7,"value":"## Let's find you a scale","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":9,"value":"viewof edo = Inputs.range([12, 53], { label: \"EDO:\", value: 12, step: 1 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":15,"value":"viewof nbNotes = Inputs.range([1, edo], { label: \"Number of notes:\", value: 7, step: 1 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":24,"value":"viewof darkness = Inputs.range([1, nbNotes], { label: \"Darkness:\", value: 1, step: 1 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":27,"value":"viewof interval = Inputs.range([1, edo], { label: 'Circle of interval:', value: 0.58 * edo, step: 1 })","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":30,"value":"## Here is the circle of ${interval}d for ${edo}edo","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":34,"value":"circle = {\n let results = [0]\n for (let i = 1; i < edo; i++) {\n let note = (i * interval) % edo\n results.push(note)\n }\n return results\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":52,"value":"## Here is your scale","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":54,"value":"scale = {\n let light = circle.slice(0, nbNotes-darkness+1)\n let dark = circle.slice(edo-darkness+1, edo)\n let result = [...light, ...dark]\n result.sort((a, b) => a - b)\n return result\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":65,"value":"## Hear it out","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":72,"value":"$48","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":69,"value":"

\n\t\t

Scale Audio Player

\n\t\t

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"}],"files":"$W49","stdlib":"1"}} 47:"$46:body"