tone
Version:
A Web Audio framework for making interactive music in the browser.
140 lines • 5 kB
JavaScript
import { Monophonic } from "./Monophonic";
import { MonoSynth } from "./MonoSynth";
import { Signal } from "../signal/Signal";
import { readOnly } from "../core/util/Interface";
import { LFO } from "../source/oscillator/LFO";
import { Gain, } from "../core/context/Gain";
import { Multiply } from "../signal/Multiply";
import { deepMerge, omitFromObject, optionsFromArguments } from "../core/util/Defaults";
/**
* DuoSynth is a monophonic synth composed of two [[MonoSynths]] run in parallel with control over the
* frequency ratio between the two voices and vibrato effect.
* @example
* const duoSynth = new Tone.DuoSynth().toDestination();
* duoSynth.triggerAttackRelease("C4", "2n");
* @category Instrument
*/
export class DuoSynth extends Monophonic {
constructor() {
super(optionsFromArguments(DuoSynth.getDefaults(), arguments));
this.name = "DuoSynth";
const options = optionsFromArguments(DuoSynth.getDefaults(), arguments);
this.voice0 = new MonoSynth(Object.assign(options.voice0, {
context: this.context,
onsilence: () => this.onsilence(this)
}));
this.voice1 = new MonoSynth(Object.assign(options.voice1, {
context: this.context,
}));
this.harmonicity = new Multiply({
context: this.context,
units: "positive",
value: options.harmonicity,
});
this._vibrato = new LFO({
frequency: options.vibratoRate,
context: this.context,
min: -50,
max: 50
});
// start the vibrato immediately
this._vibrato.start();
this.vibratoRate = this._vibrato.frequency;
this._vibratoGain = new Gain({
context: this.context,
units: "normalRange",
gain: options.vibratoAmount
});
this.vibratoAmount = this._vibratoGain.gain;
this.frequency = new Signal({
context: this.context,
units: "frequency",
value: 440
});
this.detune = new Signal({
context: this.context,
units: "cents",
value: options.detune
});
// control the two voices frequency
this.frequency.connect(this.voice0.frequency);
this.frequency.chain(this.harmonicity, this.voice1.frequency);
this._vibrato.connect(this._vibratoGain);
this._vibratoGain.fan(this.voice0.detune, this.voice1.detune);
this.detune.fan(this.voice0.detune, this.voice1.detune);
this.voice0.connect(this.output);
this.voice1.connect(this.output);
readOnly(this, ["voice0", "voice1", "frequency", "vibratoAmount", "vibratoRate"]);
}
getLevelAtTime(time) {
time = this.toSeconds(time);
return this.voice0.envelope.getValueAtTime(time) + this.voice1.envelope.getValueAtTime(time);
}
static getDefaults() {
return deepMerge(Monophonic.getDefaults(), {
vibratoAmount: 0.5,
vibratoRate: 5,
harmonicity: 1.5,
voice0: deepMerge(omitFromObject(MonoSynth.getDefaults(), Object.keys(Monophonic.getDefaults())), {
filterEnvelope: {
attack: 0.01,
decay: 0.0,
sustain: 1,
release: 0.5
},
envelope: {
attack: 0.01,
decay: 0.0,
sustain: 1,
release: 0.5
}
}),
voice1: deepMerge(omitFromObject(MonoSynth.getDefaults(), Object.keys(Monophonic.getDefaults())), {
filterEnvelope: {
attack: 0.01,
decay: 0.0,
sustain: 1,
release: 0.5
},
envelope: {
attack: 0.01,
decay: 0.0,
sustain: 1,
release: 0.5
}
}),
});
}
/**
* Trigger the attack portion of the note
*/
_triggerEnvelopeAttack(time, velocity) {
// @ts-ignore
this.voice0._triggerEnvelopeAttack(time, velocity);
// @ts-ignore
this.voice1._triggerEnvelopeAttack(time, velocity);
}
/**
* Trigger the release portion of the note
*/
_triggerEnvelopeRelease(time) {
// @ts-ignore
this.voice0._triggerEnvelopeRelease(time);
// @ts-ignore
this.voice1._triggerEnvelopeRelease(time);
return this;
}
dispose() {
super.dispose();
this.voice0.dispose();
this.voice1.dispose();
this.frequency.dispose();
this.detune.dispose();
this._vibrato.dispose();
this.vibratoRate.dispose();
this._vibratoGain.dispose();
this.harmonicity.dispose();
return this;
}
}
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