Yamaha DTXpress/DTXplorer/DTXtreme

hello,

do anybody know why I get always a long delay on input 8 and 9 ? (Tom3 
and crash2).
I use 8 for Bass Tom and 9 for Floor Tom.
I tried to tweek the delay but nothing realy helped.
If one of you had an idea how to improve those sounds.

Thnx

Claude