export default function (audioCtx, destination, time, {level, tone, decay}) {
// parameters
const outputLevel = equalPower(level);
const vcfFreq = 200 + tone * 20;
const decayTime = decay * 5 + 50;
// audio modules
const vco = new VCO(SINE, audioCtx);
vco.frequency.value = START_FREQ;
const vcf = new VCF(LOWPASS, audioCtx);
vcf.frequency.value = vcfFreq;
vcf.Q.value = 1;
const click = new PulseTrigger(audioCtx);
const vca = new VCA(audioCtx);
vca.amplitude.value = 0;
const outputVCA = new VCA(audioCtx);
outputVCA.amplitude.value = outputLevel + 0.4;
const softClipper = new SoftClipper(0.6, audioCtx);
// envelopes
const oscEnv = new ADGenerator(EXPONENTIAL, 0.11, decayTime, START_FREQ, FREQ_AMT);
const ampEnv = new ADGenerator(LINEAR, 2, decayTime, 0.0, 1.0);
// module routing
vco.connect(vca);
click.connect(vca);
vca.connect(vcf);
vcf.connect(softClipper);
softClipper.connect(outputVCA);
// envelope routing
oscEnv.connect(vco.frequency);
ampEnv.connect(vca.amplitude);
// output routing
outputVCA.connect(destination);
// envelope/oscillator triggering
vco.start(time);
ampEnv.trigger(time);
oscEnv.trigger(time);
click.trigger(time, audioCtx);
// cleanup
window.setTimeout(() => {
vco.oscillator.stop();
outputVCA.disconnect();
}, (time - audioCtx.currentTime) + 1000);
return outputVCA;
}
export default function(audioCtx, destination, time, outputLevel, decay) {
// audio modules
const oscBank = new SquareOscBank(audioCtx);
const midFilter = new VCF(BANDPASS, audioCtx);
midFilter.frequency.value = MID_FILTER_FREQ;
const highFilter = new VCF(HIGHPASS, audioCtx);
highFilter.frequency.value = HIGH_FILTER_FREQ;
const outputVCA = new VCA(audioCtx);
outputVCA.amplitude.value = outputLevel;
const modVCA = new VCA(audioCtx);
// modulators
const env = new ADGenerator(LINEAR, 0.1, decay, 0, 1);
// audio routing
oscBank.connect(midFilter);
midFilter.connect(modVCA);
modVCA.connect(highFilter);
highFilter.connect(outputVCA);
// modulation routing
env.connect(modVCA.amplitude);
// output routing
outputVCA.connect(destination);
// envelope/oscillator triggering
oscBank.start(time);
env.trigger(time);
// cleanup
window.setTimeout(() => {
oscBank.stop();
outputVCA.disconnect();
}, (time - audioCtx.currentTime) + 1000);
return outputVCA;
}
export default function(audioCtx, destination, time, { level, tone, decay }) {
// parameters
const outputLevel = equalPower(level);
const lowDecay = decay * 8.5 + 700;
// tone ratio
const lowEnvAmt = 0.666 - (tone / 100) * 0.666;
const midEnvAmt = 0.333;
const highEnvAmt = 0.666 - (1 - tone / 100) * 0.666;
// audio modules
const oscBank = new SquareOscBank(audioCtx);
const lowBandFilter = new VCF(BANDPASS, audioCtx);
lowBandFilter.frequency.value = LOW_FILTER_FREQ;
const lowVCA = new VCA(audioCtx);
const lowHighpassFilter = new VCF(HIGHPASS, audioCtx);
lowHighpassFilter.frequency.value = LOW_FILTER_FREQ;
const midHighBandFilter = new VCF(BANDPASS, audioCtx);
midHighBandFilter.frequency.value = MID_HIGH_FILTER_FREQ;
const midVCA = new VCA(audioCtx);
const midHighpassFilter = new VCF(HIGHPASS, audioCtx);
midHighpassFilter.frequency.value = MID_HIGH_FILTER_FREQ;
const highFilter = new VCF(HIGHPASS, audioCtx);
highFilter.frequency.value = HIGH_FILTER_FREQ;
const highVCA = new VCA(audioCtx);
const outputVCA = new VCA(audioCtx);
outputVCA.amplitude.value = outputLevel;
// modulators
// NOTE: for tone control adjust the amounts of each band's env amount instead of having a dedicated mixer node
const lowEnv = new ADGenerator(EXPONENTIAL, 0.1, lowDecay, 0, lowEnvAmt);
const midEnv = new ADGenerator(EXPONENTIAL, 0.1, MID_DECAY, 0, midEnvAmt);
const highEnv = new ADGenerator(EXPONENTIAL, 0.1, HIGH_DECAY, 0, highEnvAmt);
// band splitting
oscBank.connect(lowBandFilter);
oscBank.connect(midHighBandFilter);
// low band routing
lowBandFilter.connect(lowVCA);
lowVCA.connect(lowHighpassFilter);
lowHighpassFilter.connect(outputVCA);
// mid band routing
midHighBandFilter.connect(midVCA);
midVCA.connect(midHighpassFilter);
midHighpassFilter.connect(outputVCA);
// high band routing
midHighBandFilter.connect(highVCA);
highVCA.connect(highFilter);
highFilter.connect(outputVCA);
// modulation routing
lowEnv.connect(lowVCA.amplitude);
midEnv.connect(midVCA.amplitude);
highEnv.connect(highVCA.amplitude);
// output routing
outputVCA.connect(destination);
// envelope/oscillator triggering
oscBank.start(time);
lowEnv.trigger(time);
midEnv.trigger(time);
highEnv.trigger(time);
// cleanup
window.setTimeout(() => {
oscBank.stop();
outputVCA.disconnect();
}, time - audioCtx.currentTime + 2000);
return outputVCA;
}