[sdiy] Percussion MIDI controller - again

[Kevin Lightner]

>
>>Don't give up!  You should be able to get this idea to work.
>
>Thanks for the encouragement! I was indeed almost about to give up.

While possibly not too related, a long time I ago I made a "Midi - 
Vibes" type instrument using 3 Roland PAD-8 (Octapad) PCBs. 
Admittedly, I was working in the Roland service center at the time 
and they were kinda easy to get ;-)
I modded them for additional gain on the inputs and adjusted their 
software sensetivities to a usable range. A single keypad and display 
was switched between the boards.
Midi outputs were merged and remapped.

I started the design previously with discreet components, but found 
myself in a parts duplication jungle from all of the conditioning for 
spikes and other considerations.
Comparators, R/C delay networks, one-shots, etc.
It was to be installed on real vibes and with what soft mallets were 
used, signals had to qualified pretty well.

One feature the PAD-8s had though were cancellation pickups on the case.
If these sensed a larger signal than the pads, they disqualified any 
pad signals in order to avoid mistriggers. Kind of a smart idea. :)

-- 
Regards,
Kevin Lightner

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