Yamaha DTXpress/DTXplorer/DTXtreme

> 
> On the other hand, the piezo of my KP65 seemed to be reverse wired. 
> I mean, it gave a negative pulse instead of positive. I reversed the 
> leads coming out of the piezo and now it seems more responsive. My 
> KP65 is a very early serial number, FWIW.
>

It is a while since I have looked at the signals out of the pads, but
from memory I think the kick is well damped so the polarity can be
significant.  I have looked at a KP65 which was unresponsive for
someone else and that was reverse wired.

Keith.