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improve adsr

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This commit is contained in:
Felix Roos 2022-09-18 22:39:40 +02:00
parent 1eb6ff8c17
commit 3a65bc0650
1 changed files with 11 additions and 6 deletions
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17
packages/webaudio/webaudio.mjs
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@ -33,12 +33,17 @@ const getFilter = (type, frequency, Q) => {
const getADSR = (attack, decay, sustain, release, velocity, begin, end) => {
const gainNode = getAudioContext().createGain();
gainNode.gain.setValueAtTime(0, begin);
gainNode.gain.linearRampToValueAtTime(velocity, begin + attack); // attack
gainNode.gain.linearRampToValueAtTime(sustain * velocity, begin + attack + decay); // sustain start
gainNode.gain.setValueAtTime(sustain * velocity, end); // sustain end
gainNode.gain.linearRampToValueAtTime(0, end + release); // release
// for some reason, using exponential ramping creates little cracklings
let t = begin;
gainNode.gain.setValueAtTime(0, t);
gainNode.gain.exponentialRampToValueAtTime(velocity, (t += attack));
const sustainGain = Math.max(sustain * velocity, 0.001);
gainNode.gain.exponentialRampToValueAtTime(sustainGain, (t += decay));
if (end - begin < attack + decay) {
gainNode.gain.cancelAndHoldAtTime(end);
} else {
gainNode.gain.setValueAtTime(sustainGain, end);
}
gainNode.gain.exponentialRampToValueAtTime(0.001, end + release); // release
return gainNode;
};