2d:null 2e:["$","title",null,{"children":"Blues with Midi.js | Neil Turley | Observable"}] 33:T540,part1 = { let I = [three('C5'), rest, rest, two('A4'), rest, one('G4'), three('C5'), rest, rest, two('A4'), rest, one('G4'), two('C5'), rest, one('G4'), two('A4'), rest, three('C5'), rest, rest, rest, rest, rest, rest]; let IV = [ three('F5'), rest, rest, two('D5'), rest, one('C5'), three('F5'), rest, rest, two('D5'), rest, one('C5'), two('F5'), rest, one('C5'), two('D5'), rest, three('F5'), rest, rest, rest, rest, rest, rest]; let V_IV = [ three('G5'), rest, rest, two('E5'), rest, one('D5'), three('G5'), rest, rest, two('E5'), rest, one('D5'), three('F5'), rest, rest, two('D5'), rest, one('C5'), three('F5'), rest, rest, two('D5'), rest, one('C5')]; let I_V = [two('C5'), rest, one('C5'), two('Bb4'), rest, one('Bb4'), two('A4'), rest, one('A4'), two('Ab4'), rest, one('Ab4'), two('G4'), rest, one('G4'), two('G4'), rest, one('G4'), two('G4'), rest, one('G4'), two('G4'), rest, one('G4')]; return [I, I, IV, I, V_IV, I_V]; }34:[] 31:{"id":"6700f7c05e85d571","slug":"blues-with-midi-js","title":"Blues with Midi.js","thumbnail":"5622df5d286b46ab45ef60129df05323824187fe348da457170a3a8922593d49","access_level":"public","create_time":"$D2020-05-17T04:19:18.240Z","update_time":"$D2022-09-07T03:09:47.413Z","view_time":null,"first_public_time":"$D2020-05-17T17:48:49.518Z","has_unpublished_edits":null,"fork":false,"stars":3,"starred":false,"owner":{"type":"team","id":"d3a5c7e199005588","login":"nturley","name":"Neil Turley","avatar_url":"https://avatars-next.observableusercontent.com/1144dcde8da195bed152315b9c34a7cd1cc33f52ca513a9b8582d9a077aff812","tier":"starter_2024"},"version":614,"publish_version":614,"role":null,"authored":false,"authors":[{"type":"individual","id":"08c0e1b672bab3d7","login":"nturley","name":"Neil 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'G2', 'A2', 'Bb2', 'A2', 'G2', 'E2'];\n let IV = ['F2', 'A2', 'C3', 'D3', 'Eb3', 'D3', 'C3', 'A2'];\n let V_IV = ['G2', 'B2', 'D3', 'E3', 'F2', 'A2', 'C3', 'D3'];\n let I_V = ['C2', 'E2', 'G2', 'A2', 'G2', 'A2', 'Bb2', 'B2'];\n return [I, I, IV, I, V_IV, I_V];\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":444,"value":"$33","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":597,"value":"mutable noteHistory = [[],[],[],[],[],[],[],[],[]];","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":599,"value":"{\n (mutable noteHistory).push(playNotes);\n (mutable noteHistory).shift()\n return noteHistory\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":610,"value":"{\n playNotes;\n return noteHistory\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":414,"value":"playNotes = {\n let playedNotes = []\n if (time.beatThirds == 0 || time.beatThirds== 2) {\n let bassNote = bassWalk[time.measure][time.measureBeat];\n playNote(0, bassNote, oneBeatSecs/3, 10);\n playedNotes.push(bassNote);\n }\n let currNote = part1[time.measure][time.measureBeatThirds];\n if (currNote.note) playedNotes.push(currNote.note);\n playNote(0, currNote.note, currNote.length, 10);\n return playedNotes;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":36,"value":"time = {\n let loopBeat = Math.floor(loopBeatThirds / 3);\n let beatThirds = loopBeatThirds % 3;\n let measure = Math.floor(loopBeat / config.bpMeasure);\n let measureBeat = loopBeat % config.bpMeasure;\n let measureBeatThirds = measureBeat * 3 + beatThirds;\n return { beatThirds, measure, measureBeat, measureBeatThirds };\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":285,"value":"loopBeatThirds = {\n let i = 0;\n while (true) {\n if (config.unmute) {\n yield i;\n }\n i = (i + 1) % (config.measuresPerLoop*config.bpMeasure * 3);\n await Promises.delay(convertBpmToMspb(config.bpMin)/3);\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":5,"value":"MIDI = require('midi.js')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":8,"value":"loaded = new Promise((resolve, reject) => {\n MIDI.loadPlugin({\n soundfontUrl: \"https://gleitz.github.io/midi-js-soundfonts/FluidR3_GM/\",\n instrument: 0,\n onsuccess: () => {\n MIDI.setVolume(0, 256);\n resolve()\n }\n });\n});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":67,"value":"function playNote(track, note, duration, velocity) {\n MIDI.noteOn(track, MIDI.keyToNote[note], velocity, 0);\n MIDI.noteOff(track, MIDI.keyToNote[note], duration);\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":85,"value":"convertBpmToMspb = (bpm) => {\n let bps = bpm / 60;\n let spb = 1/bps;\n let mspb = spb * 1000;\n return mspb;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":89,"value":"import {form} from '@mbostock/form-input'","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":95,"value":"convertBpmToSpb = (bpm)=> {\n return convertBpmToMspb(bpm) / 1000;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":93,"value":"oneBeatSecs = convertBpmToSpb(config.bpMin)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":563,"value":"function three(note){\n return {note, length:oneBeatSecs};\n }","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":565,"value":" function two(note){\n return {note, length:oneBeatSecs*2/3}; \n }","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":567,"value":" function one(note){\n return {note, length:oneBeatSecs/3};\n }","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":570,"value":"rest =({note:null, length:null});","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":547,"value":"config = {\n let c = userConfig;\n c.bpMeasure = 8;\n c.measuresPerLoop = 6;\n return c;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W34","stdlib":"1","titling":"auto"}} 32:"$31:body"