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play spooky note (theremin) and set instrument blocks

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This commit is contained in:
Eric Rosenbaum 2016-10-19 13:13:56 -04:00
parent c47957f421
commit 8715beaac7
1 changed files with 51 additions and 6 deletions
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57
src/index.js
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@ -42,12 +42,17 @@ function AudioEngine (sounds) {
'drawbar_organ', 'acoustic_guitar_nylon', 'electric_guitar_clean',
'acoustic_bass', 'pizzicato_strings', 'cello', 'trombone', 'clarinet'];
Soundfont.instrument(Tone.context, this.instrumentNames[0]).then(
function (inst) {
this.instrument = inst;
this.instrument.connect(this.effectsNode);
}.bind(this)
);
this.setInstrument(0);
// theremin setup
this.theremin = new Tone.Synth();
this.portamentoTime = 0.25;
this.theremin.portamento = this.portamentoTime;
this.thereminVibrato = new Tone.Vibrato(4, 0.5);
this.theremin.chain(this.thereminVibrato, this.effectsNode);
this.thereminTimeout;
this.thereminIsPlaying = false;
}
AudioEngine.prototype.loadSounds = function (sounds) {
@ -61,6 +66,8 @@ AudioEngine.prototype.loadSounds = function (sounds) {
AudioEngine.prototype.playSound = function (index) {
this.soundSamplers[index].triggerAttack();
this.soundSamplers[index].player.playbackRate = 1 + this.pitchShiftRatio;
};
AudioEngine.prototype.getSoundDuration = function (index) {
@ -73,6 +80,35 @@ AudioEngine.prototype.playNoteForBeats = function (note, beats) {
);
};
AudioEngine.prototype.playThereminForBeats = function (note, beats) {
// if the theremin is playing
// set frequency
// else
// trigger attack
// create a timeout for slightly longer than the duration of the block
// that releases the theremin - so we can slide continuously between
// successive notes without releasing and attacking
var freq = this._midiToFreq(note);
if (this.thereminIsPlaying) {
this.theremin.frequency.rampTo(freq, this.portamentoTime);
} else {
this.theremin.triggerAttack(freq);
this.thereminIsPlaying = true;
}
clearTimeout(this.thereminTimeout);
this.thereminTimeout = setTimeout(function () {
this.theremin.triggerRelease();
this.thereminIsPlaying = false;
}.bind(this), (1000 * beats) + 100);
};
AudioEngine.prototype._midiToFreq = function (midiNote) {
var freq = this.tone.intervalToFrequencyRatio(midiNote - 60) * 261.63; // 60 is C4
return freq;
};
AudioEngine.prototype.playDrumForBeats = function (drumNum) {
this.drumSamplers[drumNum].triggerAttack();
};
@ -134,6 +170,15 @@ AudioEngine.prototype._setPitchShift = function (value) {
}
};
AudioEngine.prototype.setInstrument = function (instrumentNum) {
return Soundfont.instrument(Tone.context, this.instrumentNames[instrumentNum]).then(
function (inst) {
this.instrument = inst;
this.instrument.connect(this.effectsNode);
}.bind(this)
);
};
AudioEngine.prototype.clearEffects = function () {
this.delay.wet.value = 0;
this._setPitchShift(0);