Fix calculation of beat time when exporting Simpler device to Ableton.

src/lib/exporters/ableton/builders.ts

@@ -555,7 +555,10 @@ async function buildSimplerDevice(koTrack: AblTrack, abletonVersion: AbletonVers
         {
           '@Id': 1,
           '@SecTime': koTrack.soundLength,
-          '@BeatTime': koTrack.timeStretchBars * koTrack.timeSignature.numerator, // convert bars to beats
+          '@BeatTime':
+            koTrack.timeStretchBars *
+            koTrack.timeSignature.numerator *
+            (4 / koTrack.timeSignature.denominator),
         },
       ];
   }