Hi pal,
if you want to, i can make that one as a Flash application for
the Mojocafe!
The only problem is that Flash as plugin is not the best one in
reaction what means that there would be minor differences in
milliseconds, i suggest.

What i mean you can see and download here:
http://www.mojocafe.net/testing/drums.swf

If you hit a lot of drums at the same time or within a few
seconds, the system goes down on its knees.

Nevertheless, as mentioned: if you want to, i can try to
make a Mojo for Mojocafe.net as BPM counter.

Greetings,
Carlos