Roel, 1200 may be the number of different samples used for Megavoices.
Each different megavoice has several samples assgned to it even on the existing tyros. some of these are tuned (different for each note) and some are not (slide, buzz, scrape noises etc). The sample that sounds normally depends on the midi velocity at the time although other cc values can be used.
Viewed like this then 1200 sounds (samples) may not be as many as you first think.
Keith
[This message has been edited by KFingers (edited 09-21-2005).]