It's a good suggestion for oriental sounds like tabla.

I think it's possible to assign 2 different samples at the most in one key with the velocity...

The manual :
"F7 DCA Offs: This modifies the sample level at minimum velocity.
F8 DCA Slop: This modifies the sample level at maximum velocity"

And, I think, if I play with 2 sounds, layered or not, the memory usage is the same, no?

And I have already the patterns of the X1 oriental I just want to make a good drum kit, the same as the X1 with the same mapping, to have a good sound...