Add effect value calculation functions for Ableton export

src/lib/exporters/ableton/effects.ts

@@ -0,0 +1,64 @@
+type AbletonVersion = '10' | '11';
+
+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) * 100,
+    tone: normalized(y) * 100,
+  };
+}
+
+export function chorusEffectValues(x: number, y: number, abletonVersion: AbletonVersion) {
+  const rateMin = abletonVersion === '10' ? 0.03 : 0.1;
+  const rateMax = abletonVersion === '10' ? 10 : 15;
+  return {
+    rate: rateMin * (rateMax / rateMin) ** normalized(x),
+    amount: abletonVersion === '10' ? 3.25 : 0.5,
+    feedback: normalized(y) * (abletonVersion === '10' ? 0.95 : 0.99),
+  };
+}
+
+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 ** ((-6 - drive * 30) / 20),
+    ratio: 4,
+    attack: 30 * (0.1 / 30) ** speed,
+    release: 300 * (30 / 300) ** speed,
+  };
+}

src/lib/exporters/ableton/types/simpler.ts

@@ -187,7 +187,7 @@ interface MultiSampleMap {
   RoundRobinRandomSeed: ValueElement;
 }
 
-interface LoopModulator {
+interface LoopModulators {
   IsModulated: ValueElement;
   SampleStart: ManualElement;
   SampleLength: ManualElement;
@@ -196,10 +196,6 @@ interface LoopModulator {
   LoopFade: ManualElement;
 }
 
-interface LoopModulators {
-  LoopModulator: LoopModulator;
-}
-
 interface Player {
   MultiSampleMap: MultiSampleMap;
   LoopModulators: LoopModulators;