Hi Anthony - that video did help quite a bit. As expected, I just didn't get it. I was able to set up multiple tracks and selectively undo/re-record them. It's still a bit jumpy when I'm on the last recorded track and want to go back to the first track as the Aeros adds one or more empty tracks. For example, if I have three tracks and want to go back to track two; what happens when I tap next track is I add a track 4&5 and then it may jump back to track 1 where I can tap once more and get to track 2. Is there something I'm missing about distinguishing between "add" and "next"? The empty tracks aren't so much a problem as I now know how to write over them but it adds to the confusion as I didn't intend to add those tracks. I did also recognize the single level of undo...a update to allow multiple undos would be a welcome feature. (hopefully, my lizard-brain would be able to figure it out!) Thanks!