summaryrefslogtreecommitdiffstats
path: root/Processing-js/libs/js/MIDI/Plugin.js
blob: 7647f965f3c99f6d8a0b60ac01c06036df4b7f7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
/*
	--------------------------------------------
	MIDI.Plugin : 0.3.2 : 2013/01/26
	--------------------------------------------
	https://github.com/mudcube/MIDI.js
	--------------------------------------------
	Inspired by javax.sound.midi (albeit a super simple version): 
		http://docs.oracle.com/javase/6/docs/api/javax/sound/midi/package-summary.html
	--------------------------------------------
	Technologies:
		MIDI.WebMIDI
		MIDI.WebAudio
		MIDI.Flash
		MIDI.AudioTag
	--------------------------------------------
	Helpers:
		MIDI.GeneralMIDI
		MIDI.channels
		MIDI.keyToNote
		MIDI.noteToKey
*/

if (typeof (MIDI) === "undefined") var MIDI = {};

(function() { "use strict";

var setPlugin = function(root) {
	MIDI.api = root.api;
	MIDI.setVolume = root.setVolume;
	MIDI.programChange = root.programChange;
	MIDI.noteOn = root.noteOn;
	MIDI.noteOff = root.noteOff;
	MIDI.chordOn = root.chordOn;
	MIDI.chordOff = root.chordOff;
	MIDI.stopAllNotes = root.stopAllNotes;
	MIDI.getInput = root.getInput;
	MIDI.getOutputs = root.getOutputs;
};

/*
	--------------------------------------------
	Web MIDI API - Native Soundbank
	--------------------------------------------
	https://dvcs.w3.org/hg/audio/raw-file/tip/midi/specification.html
	--------------------------------------------
*/

(function () {
	var plugin = null;
	var output = null;
	var channels = [];
	var root = MIDI.WebMIDI = {
		api: "webmidi"
	};
	root.setVolume = function (channel, volume) { // set channel volume
		output.send([0xB0 + channel, 0x07, volume]);
	};

	root.programChange = function (channel, program) { // change channel instrument
		output.send([0xC0 + channel, program]);
	};

	root.noteOn = function (channel, note, velocity, delay) {
		output.send([0x90 + channel, note, velocity], delay * 1000);
	};

	root.noteOff = function (channel, note, delay) {
		output.send([0x80 + channel, note, 0], delay * 1000);
	};

	root.chordOn = function (channel, chord, velocity, delay) {
		for (var n = 0; n < chord.length; n ++) {
			var note = chord[n];
			output.send([0x90 + channel, note, velocity], delay * 1000);
		}
	};
	
	root.chordOff = function (channel, chord, delay) {
		for (var n = 0; n < chord.length; n ++) {
			var note = chord[n];
			output.send([0x80 + channel, note, 0], delay * 1000);
		}
	};
	
	root.stopAllNotes = function () {
		for (var channel = 0; channel < 16; channel ++) {
			output.send([0xB0 + channel, 0x7B, 0]);
		}
	};

	root.getInput = function () {
		return plugin.getInputs();
	};
	
	root.getOutputs = function () {
		return plugin.getOutputs();
	};

	root.connect = function (conf) {
		setPlugin(root);
        navigator.requestMIDIAccess().then(function (access) {
			plugin = access;
			output = plugin.outputs()[0];
			if (conf.callback) conf.callback();
		}, function (err) { // well at least we tried!
			if (window.AudioContext || window.webkitAudioContext) { // Chrome
				conf.api = "webaudio";
			} else if (window.Audio) { // Firefox
				conf.api = "audiotag";
			} else { // Internet Explorer
				conf.api = "flash";
			}
			MIDI.loadPlugin(conf);
		});
	};
})();

/*
	--------------------------------------------
	Web Audio API - OGG or MPEG Soundbank
	--------------------------------------------
	https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html
	--------------------------------------------
*/

if (window.AudioContext || window.webkitAudioContext) (function () {

	var AudioContext = window.AudioContext || window.webkitAudioContext;
	var root = MIDI.WebAudio = {
		api: "webaudio"
	};
	var ctx;
	var sources = {};
	var masterVolume = 127;
	var audioBuffers = {};
	var audioLoader = function (instrument, urlList, index, bufferList, callback) {
		var synth = MIDI.GeneralMIDI.byName[instrument];
		var instrumentId = synth.number;
		var url = urlList[index];
		if (!MIDI.Soundfont[instrument][url]) { // missing soundfont
			return callback(instrument);
		}
		var base64 = MIDI.Soundfont[instrument][url].split(",")[1];
		var buffer = Base64Binary.decodeArrayBuffer(base64);
		ctx.decodeAudioData(buffer, function (buffer) {
			var msg = url;
			while (msg.length < 3) msg += "&nbsp;";
			if (typeof (MIDI.loader) !== "undefined") {
				MIDI.loader.update(null, synth.instrument + "<br>Processing: " + (index / 87 * 100 >> 0) + "%<br>" + msg);
			}
			buffer.id = url;
			bufferList[index] = buffer;
			//
			if (bufferList.length === urlList.length) {
				while (bufferList.length) {
					buffer = bufferList.pop();
					if (!buffer) continue;
					var nodeId = MIDI.keyToNote[buffer.id];
					audioBuffers[instrumentId + "" + nodeId] = buffer;
				}
				callback(instrument);
			}
		});
	};

	root.setVolume = function (channel, volume) {
		masterVolume = volume;
	};

	root.programChange = function (channel, program) {
		MIDI.channels[channel].instrument = program;
	};

	root.noteOn = function (channel, note, velocity, delay) {
		/// check whether the note exists
		if (!MIDI.channels[channel]) return;
		var instrument = MIDI.channels[channel].instrument;
		if (!audioBuffers[instrument + "" + note]) return;
		/// convert relative delay to absolute delay
		if (delay < ctx.currentTime) delay += ctx.currentTime;
		/// crate audio buffer
		var source = ctx.createBufferSource();
		sources[channel + "" + note] = source;
		source.buffer = audioBuffers[instrument + "" + note];
		source.connect(ctx.destination);
		///
		if (ctx.createGain) { // firefox
			source.gainNode = ctx.createGain();
		} else { // chrome
			source.gainNode = ctx.createGainNode();
		}
		var value = (velocity / 127) * (masterVolume / 127) * 2 - 1;
		source.gainNode.connect(ctx.destination);
		source.gainNode.gain.value = Math.max(-1, value);
		source.connect(source.gainNode);
		if (source.noteOn) { // old api
			source.noteOn(delay || 0);
		} else { // new api
			source.start(delay || 0);
		}
		return source;
	};

	root.noteOff = function (channel, note, delay) {
		delay = delay || 0;
		if (delay < ctx.currentTime) delay += ctx.currentTime;
		var source = sources[channel + "" + note];
		if (!source) return;
		if (source.gainNode) {
			// @Miranet: "the values of 0.2 and 0.3 could ofcourse be used as 
			// a 'release' parameter for ADSR like time settings."
			// add { "metadata": { release: 0.3 } } to soundfont files
			var gain = source.gainNode.gain;
			gain.linearRampToValueAtTime(gain.value, delay);
			gain.linearRampToValueAtTime(-1, delay + 0.2);
		}
		if (source.noteOff) { // old api
			source.noteOff(delay + 0.3);
		} else {
			source.stop(delay + 0.3);
		}
		///
		delete sources[channel + "" + note];
	};

	root.chordOn = function (channel, chord, velocity, delay) {
		var ret = {}, note;
		for (var n = 0, length = chord.length; n < length; n++) {
			ret[note = chord[n]] = root.noteOn(channel, note, velocity, delay);
		}
		return ret;
	};

	root.chordOff = function (channel, chord, delay) {
		var ret = {}, note;
		for (var n = 0, length = chord.length; n < length; n++) {
			ret[note = chord[n]] = root.noteOff(channel, note, delay);
		}
		return ret;
	};

    root.stopAllNotes = function () {
        for (var source in sources) {
            var delay = 0;
            if (delay < ctx.currentTime) delay += ctx.currentTime;
            // @Miranet: "the values of 0.2 and 0.3 could ofcourse be used as
            // a 'release' parameter for ADSR like time settings."
            // add { "metadata": { release: 0.3 } } to soundfont files
            sources[source].gain.linearRampToValueAtTime(1, delay);
            sources[source].gain.linearRampToValueAtTime(0, delay + 0.2);
            sources[source].noteOff(delay + 0.3);
            delete sources[source];
        }
    };

	root.connect = function (conf) {
		setPlugin(root);
		//
		MIDI.Player.ctx = ctx = new AudioContext();
		///
		var urlList = [];
		var keyToNote = MIDI.keyToNote;
		for (var key in keyToNote) urlList.push(key);
		var bufferList = [];
		var pending = {};
		var oncomplete = function(instrument) {
			delete pending[instrument];
			for (var key in pending) break;
			if (!key) conf.callback();
		};
		for (var instrument in MIDI.Soundfont) {
			pending[instrument] = true;
			for (var i = 0; i < urlList.length; i++) {
				audioLoader(instrument, urlList, i, bufferList, oncomplete);
			}
		}
	};
})();

/*
	--------------------------------------------
	AudioTag <audio> - OGG or MPEG Soundbank
	--------------------------------------------
	http://dev.w3.org/html5/spec/Overview.html#the-audio-element
	--------------------------------------------
*/

if (window.Audio) (function () {

	var root = MIDI.AudioTag = {
		api: "audiotag"
	};
	var note2id = {};
	var volume = 127; // floating point 
	var channel_nid = -1; // current channel
	var channels = []; // the audio channels
	var channelInstrumentNoteIds = []; // instrumentId + noteId that is currently playing in each 'channel', for routing noteOff/chordOff calls
	var notes = {}; // the piano keys
	for (var nid = 0; nid < 12; nid++) {
		channels[nid] = new Audio();
	}

	var playChannel = function (channel, note) {
		if (!MIDI.channels[channel]) return;
		var instrument = MIDI.channels[channel].instrument;
		var instrumentId = MIDI.GeneralMIDI.byId[instrument].id;
		var note = notes[note];
		if (!note) return;
		var instrumentNoteId = instrumentId + "" + note.id;
		var nid = (channel_nid + 1) % channels.length;
		var audio = channels[nid];
		channelInstrumentNoteIds[ nid ] = instrumentNoteId;
		audio.src = MIDI.Soundfont[instrumentId][note.id];
		audio.volume = volume / 127;
		audio.play();
		channel_nid = nid;
	};

	var stopChannel = function (channel, note) {
		if (!MIDI.channels[channel]) return;
		var instrument = MIDI.channels[channel].instrument;
		var instrumentId = MIDI.GeneralMIDI.byId[instrument].id;
		var note = notes[note];
		if (!note) return;
		var instrumentNoteId = instrumentId + "" + note.id;

		for(var i=0;i<channels.length;i++){
			var nid = (i + channel_nid + 1) % channels.length;
			var cId = channelInstrumentNoteIds[nid];

			if(cId && cId == instrumentNoteId){
				channels[nid].pause();
				channelInstrumentNoteIds[nid] = null;
				return;
			}
		}
	};

	root.programChange = function (channel, program) {
		MIDI.channels[channel].instrument = program;
	};

	root.setVolume = function (channel, n) {
		volume = n; //- should be channel specific volume
	};

	root.noteOn = function (channel, note, velocity, delay) {
		var id = note2id[note];
		if (!notes[id]) return;
		if (delay) {
			return window.setTimeout(function () {
				playChannel(channel, id);
			}, delay * 1000);
		} else {
			playChannel(channel, id);
		}
	};
	
	root.noteOff = function (channel, note, delay) {
		var id = note2id[note];
		if (!notes[id]) return;
		if (delay) {
			return setTimeout(function() {
				stopChannel(channel, id);
			}, delay * 1000)
		} else {
			stopChannel(channel, id);
		}
	};
	
	root.chordOn = function (channel, chord, velocity, delay) {
		for (var idx = 0; idx < chord.length; idx ++) {
			var n = chord[idx];
			var id = note2id[n];
			if (!notes[id]) continue;
			if (delay) {
				return window.setTimeout(function () {
					playChannel(channel, id);
				}, delay * 1000);
			} else {
				playChannel(channel, id);
			}
		}
	};
	
	root.chordOff = function (channel, chord, delay) {
		for (var idx = 0; idx < chord.length; idx ++) {
			var n = chord[idx];
			var id = note2id[n];
			if (!notes[id]) continue;
			if (delay) {
				return window.setTimeout(function () {
					stopChannel(channel, id);
				}, delay * 1000);
			} else {
				stopChannel(channel, id);
			}
		}
	};
	
	root.stopAllNotes = function () {
		for (var nid = 0, length = channels.length; nid < length; nid++) {
			channels[nid].pause();
		}
	};
	
	root.connect = function (conf) {
		for (var key in MIDI.keyToNote) {
			note2id[MIDI.keyToNote[key]] = key;
			notes[key] = {
				id: key
			};
		}
		setPlugin(root);
		///
		if (conf.callback) conf.callback();
	};
})();

/*
	--------------------------------------------
	Flash - MP3 Soundbank
	--------------------------------------------
	http://www.schillmania.com/projects/soundmanager2/
	--------------------------------------------
*/
	
(function () {

	var root = MIDI.Flash = {
		api: "flash"
	};
	var noteReverse = {};
	var notes = {};

	root.programChange = function (channel, program) {
		MIDI.channels[channel].instrument = program;
	};

	root.setVolume = function (channel, note) {

	};

	root.noteOn = function (channel, note, velocity, delay) {
		if (!MIDI.channels[channel]) return;
		var instrument = MIDI.channels[channel].instrument;
		var id = MIDI.GeneralMIDI.byId[instrument].number;
		note = id + "" + noteReverse[note];
		if (!notes[note]) return;
		if (delay) {
			return window.setTimeout(function() { 
				notes[note].play({ volume: velocity * 2 });
			}, delay * 1000);
		} else {
			notes[note].play({ volume: velocity * 2 });
		}
	};

	root.noteOff = function (channel, note, delay) {

	};

	root.chordOn = function (channel, chord, velocity, delay) {
		if (!MIDI.channels[channel]) return;
		var instrument = MIDI.channels[channel].instrument;
		var id = MIDI.GeneralMIDI.byId[instrument].number;
		for (var key in chord) {
			var n = chord[key];
			var note = id + "" + noteReverse[n];
			if (notes[note]) {
				notes[note].play({ volume: velocity * 2 });
			}
		}
	};

	root.chordOff = function (channel, chord, delay) {

	};

	root.stopAllNotes = function () {

	};

	root.connect = function (instruments, conf) {
		soundManager.flashVersion = 9;
		soundManager.useHTML5Audio = true;
		soundManager.url = conf.soundManagerSwfUrl || '../inc/SoundManager2/swf/';
		soundManager.useHighPerformance = true;
		soundManager.wmode = 'transparent';
		soundManager.flashPollingInterval = 1;
		soundManager.debugMode = false;
		soundManager.onload = function () {
			var createBuffer = function(instrument, id, onload) {
				var synth = MIDI.GeneralMIDI.byName[instrument];
				var instrumentId = synth.number;
				notes[instrumentId+""+id] = soundManager.createSound({
					id: id,
					url: MIDI.soundfontUrl + instrument + "-mp3/" + id + ".mp3",
					multiShot: true,
					autoLoad: true,
					onload: onload
				});			
			};
			var loaded = [];
			var samplesPerInstrument = 88;
			var samplesToLoad = instruments.length * samplesPerInstrument;
				
			for (var i = 0; i < instruments.length; i++) {
				var instrument = instruments[i];
				var onload = function () {
					loaded.push(this.sID);
					if (typeof (MIDI.loader) === "undefined") return;
					MIDI.loader.update(null, "Processing: " + this.sID);
				};
				for (var j = 0; j < samplesPerInstrument; j++) {
					var id = noteReverse[j + 21];
					createBuffer(instrument, id, onload);
				}
			}
			///
			setPlugin(root);
			//
			var interval = window.setInterval(function () {
				if (loaded.length < samplesToLoad) return;
				window.clearInterval(interval);
				if (conf.callback) conf.callback();
			}, 25);
		};
		soundManager.onerror = function () {

		};
		for (var key in MIDI.keyToNote) {
			noteReverse[MIDI.keyToNote[key]] = key;
		}
	};
})();

/*
	helper functions
*/

// instrument-tracker
MIDI.GeneralMIDI = (function (arr) {
	var clean = function(v) {
		return v.replace(/[^a-z0-9 ]/gi, "").replace(/[ ]/g, "_").toLowerCase();
	};
	var ret = {
		byName: {},
		byId: {},
		byCategory: {}
	};
	for (var key in arr) {
		var list = arr[key];
		for (var n = 0, length = list.length; n < length; n++) {
			var instrument = list[n];
			if (!instrument) continue;
			var num = parseInt(instrument.substr(0, instrument.indexOf(" ")), 10);
			instrument = instrument.replace(num + " ", "");
			ret.byId[--num] = 
			ret.byName[clean(instrument)] = 
			ret.byCategory[clean(key)] = {
				id: clean(instrument),
				instrument: instrument,
				number: num,
				category: key
			};
		}
	}
	return ret;
})({
	'Piano': ['1 Acoustic Grand Piano', '2 Bright Acoustic Piano', '3 Electric Grand Piano', '4 Honky-tonk Piano', '5 Electric Piano 1', '6 Electric Piano 2', '7 Harpsichord', '8 Clavinet'],
	'Chromatic Percussion': ['9 Celesta', '10 Glockenspiel', '11 Music Box', '12 Vibraphone', '13 Marimba', '14 Xylophone', '15 Tubular Bells', '16 Dulcimer'],
	'Organ': ['17 Drawbar Organ', '18 Percussive Organ', '19 Rock Organ', '20 Church Organ', '21 Reed Organ', '22 Accordion', '23 Harmonica', '24 Tango Accordion'],
	'Guitar': ['25 Acoustic Guitar (nylon)', '26 Acoustic Guitar (steel)', '27 Electric Guitar (jazz)', '28 Electric Guitar (clean)', '29 Electric Guitar (muted)', '30 Overdriven Guitar', '31 Distortion Guitar', '32 Guitar Harmonics'],
	'Bass': ['33 Acoustic Bass', '34 Electric Bass (finger)', '35 Electric Bass (pick)', '36 Fretless Bass', '37 Slap Bass 1', '38 Slap Bass 2', '39 Synth Bass 1', '40 Synth Bass 2'],
	'Strings': ['41 Violin', '42 Viola', '43 Cello', '44 Contrabass', '45 Tremolo Strings', '46 Pizzicato Strings', '47 Orchestral Harp', '48 Timpani'],
	'Ensemble': ['49 String Ensemble 1', '50 String Ensemble 2', '51 Synth Strings 1', '52 Synth Strings 2', '53 Choir Aahs', '54 Voice Oohs', '55 Synth Choir', '56 Orchestra Hit'],
	'Brass': ['57 Trumpet', '58 Trombone', '59 Tuba', '60 Muted Trumpet', '61 French Horn', '62 Brass Section', '63 Synth Brass 1', '64 Synth Brass 2'],
	'Reed': ['65 Soprano Sax', '66 Alto Sax', '67 Tenor Sax', '68 Baritone Sax', '69 Oboe', '70 English Horn', '71 Bassoon', '72 Clarinet'],
	'Pipe': ['73 Piccolo', '74 Flute', '75 Recorder', '76 Pan Flute', '77 Blown Bottle', '78 Shakuhachi', '79 Whistle', '80 Ocarina'],
	'Synth Lead': ['81 Lead 1 (square)', '82 Lead 2 (sawtooth)', '83 Lead 3 (calliope)', '84 Lead 4 (chiff)', '85 Lead 5 (charang)', '86 Lead 6 (voice)', '87 Lead 7 (fifths)', '88 Lead 8 (bass + lead)'],
	'Synth Pad': ['89 Pad 1 (new age)', '90 Pad 2 (warm)', '91 Pad 3 (polysynth)', '92 Pad 4 (choir)', '93 Pad 5 (bowed)', '94 Pad 6 (metallic)', '95 Pad 7 (halo)', '96 Pad 8 (sweep)'],
	'Synth Effects': ['97 FX 1 (rain)', '98 FX 2 (soundtrack)', '99 FX 3 (crystal)', '100 FX 4 (atmosphere)', '101 FX 5 (brightness)', '102 FX 6 (goblins)', '103 FX 7 (echoes)', '104 FX 8 (sci-fi)'],
	'Ethnic': ['105 Sitar', '106 Banjo', '107 Shamisen', '108 Koto', '109 Kalimba', '110 Bagpipe', '111 Fiddle', '112 Shanai'],
	'Percussive': ['113 Tinkle Bell', '114 Agogo', '115 Steel Drums', '116 Woodblock', '117 Taiko Drum', '118 Melodic Tom', '119 Synth Drum'],
	'Sound effects': ['120 Reverse Cymbal', '121 Guitar Fret Noise', '122 Breath Noise', '123 Seashore', '124 Bird Tweet', '125 Telephone Ring', '126 Helicopter', '127 Applause', '128 Gunshot']
});

// channel-tracker
MIDI.channels = (function () { // 0 - 15 channels
	var channels = {};
	for (var n = 0; n < 16; n++) {
		channels[n] = { // default values
			instrument: 0,
			// Acoustic Grand Piano
			mute: false,
			mono: false,
			omni: false,
			solo: false
		};
	}
	return channels;
})();

//
MIDI.pianoKeyOffset = 21;

// note conversions
MIDI.keyToNote = {}; // C8  == 108
MIDI.noteToKey = {}; // 108 ==  C8
(function () {
	var A0 = 0x15; // first note
	var C8 = 0x6C; // last note
	var number2key = ["C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B"];
	for (var n = A0; n <= C8; n++) {
		var octave = (n - 12) / 12 >> 0;
		var name = number2key[n % 12] + octave;
		MIDI.keyToNote[name] = n;
		MIDI.noteToKey[n] = name;
	}
})();

})();