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Implement pitch slide

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Raphael Forment 2023-09-04 06:25:49 +02:00
parent fdc201a799
commit 60f5032b12
1 changed files with 15 additions and 3 deletions
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18
packages/superdough/synth.mjs
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@ -42,6 +42,8 @@ export function registerSynthSounds() {
fmwave: fmWaveform = 'sine', fmwave: fmWaveform = 'sine',
vibrato = 0, vibrato = 0,
vdepth = 100, vdepth = 100,
slide,
slide_speed = 1,
} = value; } = value;
let { n, note, freq } = value; let { n, note, freq } = value;
// with synths, n and note are the same thing // with synths, n and note are the same thing
@ -55,7 +57,16 @@ export function registerSynthSounds() {
} }
// maybe pull out the above frequency resolution?? (there is also getFrequency but it has no default) // maybe pull out the above frequency resolution?? (there is also getFrequency but it has no default)
// make oscillator // make oscillator
const { node: o, stop } = getOscillator({ t, s: wave, freq, vibrato, vdepth, partials: n }); const { node: o, stop } = getOscillator({
t,
s: wave,
freq,
vibrato,
vdepth,
slide: slide * freq,
slide_speed: sustain / slide_speed,
partials: n,
});
// FM + FM envelope // FM + FM envelope
let stopFm, fmEnvelope; let stopFm, fmEnvelope;
@ -139,7 +150,7 @@ export function waveformN(partials, type) {
return osc; return osc;
} }
export function getOscillator({ s, freq, t, vibrato, vdepth, partials }) { export function getOscillator({ s, freq, t, vibrato, vdepth, slide, slide_speed, partials }) {
// Additional oscillator for vibrato effect // Additional oscillator for vibrato effect
if (vibrato > 0) { if (vibrato > 0) {
var vibrato_oscillator = getAudioContext().createOscillator(); var vibrato_oscillator = getAudioContext().createOscillator();
@ -156,8 +167,8 @@ export function getOscillator({ s, freq, t, vibrato, vdepth, partials }) {
} }
if (vibrato > 0) { if (vibrato > 0) {
// Vibrato by creating a gain node
o.frequency.value = Number(freq); o.frequency.value = Number(freq);
slide > 0 && o.frequency.linearRampToValueAtTime(freq + slide, t + slide_speed);
var gain = getAudioContext().createGain(); var gain = getAudioContext().createGain();
gain.gain.value = vdepth * 100; gain.gain.value = vdepth * 100;
vibrato_oscillator.connect(gain); vibrato_oscillator.connect(gain);
@ -174,6 +185,7 @@ export function getOscillator({ s, freq, t, vibrato, vdepth, partials }) {
} else { } else {
// Normal operation, without vibrato // Normal operation, without vibrato
o.frequency.value = Number(freq); o.frequency.value = Number(freq);
slide > 0 && o.frequency.linearRampToValueAtTime(freq + slide, t + slide_speed);
o.start(t); o.start(t);
const stop = (time) => o.stop(time); const stop = (time) => o.stop(time);
return { node: o, stop }; return { node: o, stop };