diff --git a/src/lib/exporters/ableton/builders.ts b/src/lib/exporters/ableton/builders.ts
index 5ab1a52..fb69c62 100644
--- a/src/lib/exporters/ableton/builders.ts
+++ b/src/lib/exporters/ableton/builders.ts
@@ -625,6 +625,8 @@ async function buildDrumRackDevice(koTrack: AblTrack, abletonVersion: AbletonVer
       continue;
     }
 
+    // EP133 is 3x4 (top→bottom), Ableton Drum Rack is 4x4 (bottom→top)
+    // flip vertically: row 3 → row 0, row 0 → row 3
     const drumPad = getDrumRackMidiNote(subtrack.padCode) - 36;
 
     const drumBranch = structuredClone(drumBranchTemplate.DrumBranch);
@@ -635,7 +637,7 @@ async function buildDrumRackDevice(koTrack: AblTrack, abletonVersion: AbletonVer
     drumBranch.Name.UserName['@Value'] = subtrack.name;
     drumBranch.BranchInfo.ReceivingNote['@Value'] = note;
     drumBranch.BranchInfo.SendingNote['@Value'] =
-      subtrack.drumRackSendingNote ?? subtrack.rootNote;
+      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(