Quote:

How many sax tones are there? Many more than bass tones.




I disagree. A professional bassist can get a lot of different sounds from the same instrument, let alone using different instruments, amps, etc. In fact, I think bass can be one of the most difficult instruments to recreate via MIDI:

https://www.youtube.com/watch?v=Eb3QzDWJ7RU&feature=related



Quote:

Take sax, if my MIDI sax sounds Getz-ish and the RT sax sounds Brecker-ish, putting a few Getz-ish notes in the middle of a Brecker-ish part is not going to sound very good to my ears. What if I have a Getz-ish sax, Turrentine-ish sax, Clemmons-ish sax but not Brecker-ish sax? I'm still not going to get an acceptable match.




Do you know Celmony Melodyne? I think it's a killer combination with Realtracks, and could be what you're looking for

https://www.youtube.com/watch?v=I4YEebBN2ok