When you put it in single mode, you'll need to save that change in a user location. You can't switch performances without saving the changes to the current performance or it goes back to the factory preset.

As far as your second question, I'm not sure I completely understand. I have 2 guesses.
1. it's playing back on a different channel than you recorded it on.
2. you've moved around from the time you recorded to the time you played it back. If you switched performances in that time, the track you've recorded will be played on whatever instrument the performance you moved to has on that track.

[This message has been edited by FAEbGBD (edited 12-17-2001).]