Yamaha DTXpress/DTXplorer/DTXtreme

Hello All,
I've finally had a chance to put some pictures up on my Yamaha DIY 
EDrum set. I'll be posting more detailed information on the site 
describing each picture soon. I'm trying to give back to the DIY 
community as I have learned much from a zillion people, posts and 
sources out here on the 'net.

My main question is a call for help/review on my Discrete Trigger 
Box circuit that I have built for the DTXpress III. I know there 
were discussions regarding a "Magic Box" a while back, but I haven't 
seen much more about it, so I decided to go ahead and try building 
one of my own design. I'll be the first confess that I'm an 
electronics "novice hack", so I'd be happy to get some feedback from 
those much wiser than I on the circuit design I have posted on my 
site.

I've built the DTB (discrete trigger box) and it 
seems to work great, with only a couple of minor oddities. For 
example, sometimes the input from the main trigger pizeo will seem 
to "overpower" the circuit and cause a secondary trigger to fire. 
(probably 'cause these 35mm piezos seem to hit 40V if smacked hard) 
I've handled this by putting a potentiometer on the main piezo to 
lower the output, but I'd like to find out if there is a better way 
to isolate it in the circuit. Thanks for any feedback.

You can checkout my DIY drums here:
http://www.htmediaservices.com

Regards,
- Rudy (captainbingo)