Don...
By plugging into inputs 3 & 4 you are getting the benefit of the flattest of flat, unprocessed signals. The Bose guys say those two chanels are used mostly for CD, MP3 players where the media has already been processed.

If you have your new Ty2 tweaked just the way you want it, I would agree that inputs 3&4 are probably going to satisfy your ears.

What about your mic? Are you running it through the KB or into one of the other inputs on the Bose?

Eddie