1. Record a loop going straight into to play mode.
2. Switch to overdub and add some material on top.
3. Switch to play mode.
4. Click undo.
At this point, all is as expected. You’ll hear the original base loop, but then…
5. Switch back to overdub…and you’ll hear the second layer of material still there.
It is though the undo is undoing the rendering of the collapsed audio in play mode but doesn’t clear out the layer from the overdub mode. I would have figured undo would have cleaned that layer out as well.
I’m running v1.01.