Refactor pattern scene generation in ableton transformer

src/lib/transformers/ableton.ts

@@ -375,7 +375,7 @@ function abletonTransformer(data: ProjectRawData, exporterParams: ExporterParams
       });
     });
 
-    data.groupPatterns
+    const unusedPatterns = data.groupPatterns
       .filter(
         (pattern) =>
           getPatternSources(pattern).length > 0 &&
@@ -385,17 +385,31 @@ function abletonTransformer(data: ProjectRawData, exporterParams: ExporterParams
         const patternDifference = a.patternNumber - b.patternNumber;
         const groupDifference = PROJECT_GROUPS.indexOf(a.group) - PROJECT_GROUPS.indexOf(b.group);
         return patternDifference || groupDifference;
-      })
-      .forEach((pattern) => {
-        const sceneIndex = ablScenes.length;
-        const sceneName = `${pattern.group.toUpperCase()} PATTERN ${String(pattern.patternNumber).padStart(2, '0')}`;
-        const timeSignature = data.scenesSettings.timeSignature;
+      });
+    const patternRows = new Map<number, GroupPattern[]>();
+    unusedPatterns.forEach((pattern) => {
+      const row = patternRows.get(pattern.patternNumber) || [];
+      row.push(pattern);
+      patternRows.set(pattern.patternNumber, row);
+    });
+
+    patternRows.forEach((patterns, patternNumber) => {
+      const sceneIndex = ablScenes.length;
+      const affectedGroups = patterns.map((pattern) => pattern.group);
+      const patternLabel = String(patternNumber).padStart(2, '0');
+      const sceneName =
+        patterns.length === 1
+          ? `${patterns[0].group.toUpperCase()} PATTERN ${patternLabel}`
+          : `PATTERN ${patternLabel} (${affectedGroups.map((group) => group.toUpperCase()).join('/')})`;
+      const timeSignature = data.scenesSettings.timeSignature;
+      ablScenes.push({
+        name: sceneName,
+        kind: 'pattern',
+        affectedGroups,
+      });
+
+      patterns.forEach((pattern) => {
         const duration = Math.max(1, pattern.bars) * getQuarterNotesPerBar(timeSignature);
-        ablScenes.push({
-          name: sceneName,
-          kind: 'pattern',
-          affectedGroups: [pattern.group],
-        });
         const occurrence = createOccurrence(
           pattern,
           sceneName,
@@ -406,6 +420,7 @@ function abletonTransformer(data: ProjectRawData, exporterParams: ExporterParams
         );
         addPatternClips(pattern, occurrence, 'session');
       });
+    });
   }
 
   let arrangementOffset = 0;