Hi Greg,
If you are editing your sounds, those edits are going into memory only and will be lost when you rewind (I think), or at the very least when you reload. It's a bit involved, but if you're determined to do it, this is the only work around I know of.

First get all your instruments loaded. Then, just for safety, in biab, open preferences and hit the midi options button. Turn off all program change messages there and close out. Now you can edit your sounds to get them as you want, then save them by doing a save bank from the tts-1. I suggest using part of your song name to name the bank as this will help identify it later on. Now save your song in a folder named in some way to identify it as needing a bank loaded when you open that song. (lol sounds worse than it is). Instead, you could use the info pop-up in biab to note that the song needs bank xxx loaded. I've used this some with SampleTank. It should work just as well for the tts-1. Hope this helps,

Jim

ps. here is a good article on the tts-1 if you haven't read it. http://www.soundonsound.com/sos/jun05/articles/sonartech.htm

I'd be completely happy if I had just one more guitar.