Hello:
You will still have to do some adjusting, keep in mind that the Voice and Style Maps in the S900 is much larger than the 2000, besides, if you want to take advantage of the better sounds like the S.A. voices....you must re-adjust your registrations, I did that when I transfer my Tyros2 registrations to the S900...I in deed made adjustments and I am very please, the S900 in my Tyros2 backup.
You will enjoy the S900 even more coming from the 2000,
Manuel
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mdorantes