Yamaha DTXpress/DTXplorer/DTXtreme

I have recently set up my DTXPRESS unit and pads to intermingle with 
my acoustic drumset. I love the setup (inspired by Akiro Jimbo) but I 
have a problem with the acoustic drum vibrations triggering 
electronic sounds. In other words, when I hit my acoustic bass 
drum/mounted toms, etc., I hear the patches from my electronic pads. 
I have messed around with the GAIN and MVEL settings, but I still 
have this trouble.

Any suggestions from the fine folk out there would be greatly 
appreciated.

Thanks,

Scott