ep-133-project-export/src/lib/exporters/ableton/effects.ts

function normalized(value: number) {
  return Math.max(0, Math.min(1, value));
}

export function delayEffectValues(x: number, y: number) {
  const length = normalized(x);
  return {
    time: Math.max(0.001, 0.017397 * (287.725 ** length - 1)),
    feedback: normalized(y) * 0.95,
  };
}

export function reverbEffectValues(x: number, y: number) {
  const color = normalized(y);
  const dark = Math.max(0, (0.5 - color) * 2);
  const bright = Math.max(0, (color - 0.5) * 2);
  return {
    decayTime: 200 + normalized(x) * 7800,
    highShelfOn: dark > 0,
    highShelfGain: 1 - dark * 0.8,
    lowShelfOn: bright > 0,
    lowShelfGain: 1 - bright * 0.8,
  };
}

export function distortionEffectValues(x: number, y: number) {
  return {
    drive: normalized(x) * 50,
    tone: normalized(y) * 100,
  };
}

export function chorusEffectValues(x: number, y: number) {
  return {
    rate: 0.1 * 100 ** normalized(x),
    feedback: normalized(y) * 0.95,
  };
}

export function filterEffectValues(x: number, y: number) {
  const cutoff = normalized(x);
  const highPass = cutoff > 0.5;
  return {
    filterType: highPass ? 1 : 0,
    cutoff: highPass ? 20 + (cutoff - 0.5) * 230 : 20 + cutoff * 230,
    resonance: normalized(y) * 1.25,
  };
}

export function compressorEffectValues(x: number, y: number) {
  const drive = normalized(x);
  const speed = normalized(y);
  return {
    threshold: 10 ** ((drive * -36) / 20),
    ratio: 4,
    attack: 50 * (0.1 / 50) ** speed,
    release: 500 * (30 / 500) ** speed,
  };
}