Enhance Ableton export with value inversion support for automation and envelopes

src/lib/exporters/ableton/automation.ts

@@ -7,6 +7,7 @@ export type AbletonAutomationTarget = {
   session?: number;
   maxValue?: number;
   soundLength?: number;
+  invertValue?: boolean;
 };
 
 export type AbletonAutomationTargets = Partial<Record<FaderParam, AbletonAutomationTarget[]>>;
@@ -64,11 +65,17 @@ export function convertFaderValue(
       break;
     case FaderParam.ATK:
       convertedValue =
-        koEnvRangeToSeconds(value * 255, target?.soundLength ?? track.soundLength) * 1000;
+        koEnvRangeToSeconds(
+          (target?.invertValue ? 1 - value : value) * 255,
+          target?.soundLength ?? track.soundLength,
+        ) * 1000;
       break;
     case FaderParam.REL:
       convertedValue =
-        koEnvRangeToSeconds(value * 255, target?.soundLength ?? track.soundLength) * 1000;
+        koEnvRangeToSeconds(
+          (target?.invertValue ? 1 - value : value) * 255,
+          target?.soundLength ?? track.soundLength,
+        ) * 1000;
       break;
     case FaderParam.PAN:
       convertedValue = (value - 0.5) * 2;

src/lib/exporters/ableton/builders.ts

@@ -67,8 +67,14 @@ function getAbletonVersion(exporterParams: ExporterParams): AbletonVersion {
   return exporterParams.abletonVersion === '10' ? '10' : '11';
 }
 
-function simplerEnvelopeMilliseconds(value: number, soundLength: number, oneshot: boolean) {
-  const milliseconds = koEnvRangeToSeconds(value, soundLength) * 1000;
+function simplerEnvelopeMilliseconds(
+  value: number,
+  soundLength: number,
+  oneshot: boolean,
+  invertValue: boolean = false,
+) {
+  const convertedValue = invertValue ? 255 - value : value;
+  const milliseconds = koEnvRangeToSeconds(convertedValue, soundLength) * 1000;
   return oneshot ? Math.min(2000, milliseconds) : milliseconds;
 }
 
@@ -104,7 +110,12 @@ function setLive10SampleReference(fileRef: any, sampleName: string) {
   fileRef.LivePackId = { '@Value': '' };
 }
 
-function targetFor(parameter: any, maxValue?: number, soundLength?: number) {
+function targetFor(
+  parameter: any,
+  maxValue?: number,
+  soundLength?: number,
+  invertValue?: boolean,
+) {
   const automationTarget =
     parameter?.AutomationTarget?.['@Id'] === undefined
       ? undefined
@@ -114,6 +125,7 @@ function targetFor(parameter: any, maxValue?: number, soundLength?: number) {
     session: automationTarget,
     maxValue,
     soundLength,
+    invertValue,
   };
 }
 
@@ -204,6 +216,7 @@ function trackAutomationTargets(midiTrack: any, includeArrangementMixer: boolean
           : simpler.VolumeAndPan.Envelope.AttackTime,
         oneshot ? 2000 : undefined,
         soundLength,
+        false,
       ),
     );
     addTarget(
@@ -215,6 +228,7 @@ function trackAutomationTargets(midiTrack: any, includeArrangementMixer: boolean
           : simpler.VolumeAndPan.Envelope.ReleaseTime,
         oneshot ? 2000 : undefined,
         soundLength,
+        oneshot,
       ),
     );
     addTarget(targets, FaderParam.MOD, targetFor(simpler.Pitch.PitchLfoAmount));
@@ -452,6 +466,7 @@ async function buildSimplerDevice(koTrack: AblTrack, abletonVersion: AbletonVers
     koTrack.release,
     koTrack.soundLength,
     oneshot,
+    oneshot,
   );
   device.VolumeAndPan.Panorama.Manual['@Value'] = koTrack.pan;
 
@@ -470,6 +485,7 @@ async function buildSimplerDevice(koTrack: AblTrack, abletonVersion: AbletonVers
       koTrack.faderParams[FaderParam.REL] * 255,
       koTrack.soundLength,
       oneshot,
+      oneshot,
     );
   }