Feature: Implement device ID assignment utility and apply it to build processes

src/lib/exporters/ableton/builders.ts

@@ -121,6 +121,14 @@ function setLive10SampleReference(fileRef: any, sampleName: string) {
   fileRef.LivePackId = { '@Value': '' };
 }
 
+export function assignDeviceListIds(devices: Record<string, any>[]) {
+  devices.forEach((device, deviceIdx) => {
+    Object.values(device).forEach((devContent: any) => {
+      devContent['@Id'] = deviceIdx;
+    });
+  });
+}
+
 function targetFor(
   parameter: any,
   maxValue?: number,
@@ -647,10 +655,12 @@ async function buildDrumRackDevice(koTrack: AblTrack, abletonVersion: AbletonVer
     drumBranch.BranchInfo.SendingNote['@Value'] = subtrack.drumRackSendingNote ?? subtrack.rootNote; // not sure if this matters
     drumBranch.BranchInfo.ChokeGroup['@Value'] = subtrack.inChokeGroup ? 1 : 0;
     drumBranch.MixerDevice.Volume.Manual['@Value'] = subtrack.volume;
-    drumBranch.DeviceChain.MidiToAudioDeviceChain.Devices = await buildSimplerDevice(
+    const branchDevices = await buildSimplerDevice(
       subtrack,
       abletonVersion,
     );
+    assignDeviceListIds([branchDevices]);
+    drumBranch.DeviceChain.MidiToAudioDeviceChain.Devices = branchDevices;
 
     device.Branches.DrumBranch.push(drumBranch);
   }
@@ -727,11 +737,7 @@ async function buildTrack(
   }
 
   // make sure id's are sequential in device chain
-  midiTrack.DeviceChain.DeviceChain.Devices['#'].forEach((device, deviceIdx) => {
+  assignDeviceListIds(midiTrack.DeviceChain.DeviceChain.Devices['#']);
-    Object.values(device).forEach((devContent: any) => {
-      devContent['@Id'] = deviceIdx;
-    });
-  });
 
   if (exporterParams.groupTracks) {
     midiTrack.DeviceChain.AudioOutputRouting.Target['@Value'] = 'AudioOut/GroupTrack';

tests/ableton-hybrid.test.ts

@@ -1,5 +1,6 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
+import { assignDeviceListIds } from '../src/lib/exporters/ableton/builders';
 import abletonTransformer, { AblTrack, getDrumRackMidiNote } from '../src/lib/transformers/ableton';
 import {
   EffectType,
@@ -144,6 +145,15 @@ function trackShape(tracks: AblTrack[]) {
   }));
 }
 
+test('assigns IDs to every device-list member, including nested rack devices', () => {
+  const devices = [{ OriginalSimpler: {} }, { AutoFilter: {} }];
+
+  assignDeviceListIds(devices);
+
+  assert.equal(devices[0].OriginalSimpler['@Id'], 0);
+  assert.equal(devices[1].AutoFilter['@Id'], 1);
+});
+
 test('automatically builds a per-group rack without flattening chromatic pads', () => {
   const result = abletonTransformer(project(), {
     includeArchivedSamples: true,