Yamaha DTXpress/DTXplorer/DTXtreme

Preset, as far as I know, the brain doesn't have sounds assigned to 
either switch on the Snare, just the piezo with both switches closed 
as the snare. You have to manually go in and assign sounds to the 
switches. As for that, I'm not completely sure as I don't have my 
DTXpress yet, can get it in a few weeks. I have read the manual 
online and I believe you have to go into the trigger mode and hit the 
snare to select it and then I'm not sure form there. Just so you 
don't worry, its not a problem with the snare or brain, its just you, 
the user, has to manually set the sounds for those switches in the 
TP65S.

-Zack