diff --git a/src/lib/exporters/utils.ts b/src/lib/exporters/utils.ts
index c46eb78..5646e6d 100644
--- a/src/lib/exporters/utils.ts
+++ b/src/lib/exporters/utils.ts
@@ -241,13 +241,21 @@ function getSoundsInfoFromProject(
 
   if (keepUnusedPatterns) {
     for (const pattern of data.groupPatterns) {
-      for (const [source, notes] of Object.entries(pattern.notes)) {
-        if (notes.length === 0) {
-          continue;
-        }
+      const sources = new Set(
+        Object.entries(pattern.notes)
+          .filter(([, notes]) => notes.length > 0)
+          .map(([source]) => Number(source)),
+      );
 
+      for (const event of pattern.events) {
+        if (event.type === 'midi' && event.source >= 0 && event.source < 12) {
+          sources.add(event.source);
+        }
+      }
+
+      for (const source of sources) {
         const pad = data.pads[pattern.group]?.find(
-          (candidate) => candidate.pad === Number(source) + 1,
+          (candidate) => candidate.pad === source + 1,
         );
         if (pad?.soundId) {
           usedSoundIds.add(pad.soundId);