I actually use a Roland V-drum sound module with my Tyros. Basically I send everything from chanel 10 to the v-drums. The prob is I can't send program changes to the v-drum, and therefore I'm always using the same drum set unless I change it on the mod. Which doesn't bother me much.

I am heavily considering getting the Motif ES rack but there are a number of problems including the fact that on the Tyros (or any arranger I imagine), you cannot send a specific program bank and number (for voices). This would make it impossible to use the keyboard styles on the module. Besides, the keboard styles are programmed with the keyboards instruments. If you'd use a mod, you'd have to retweak all the instruments, volumes, settings, etc - and it probably still would not sound as good.

You would be able to use the mod sounds for your solos (right hand), but you'd have to select the instruments from the mod - not from the arranger.

I'd love to be wrong about this - please let me know if I am.

Chony