[sdiy] Aftertouch via Pressure

[jhaible at debitel.net]

> Some soft silicon tubing connected to a transducer and 
> sealed at the other end is probably how this is done.

Yes, this is how it looks like. These transducers hace a pipe
end where you connect the tube.
Francois Buat showed me this on his Polykobol. But I've only taken
a brief glance because I was so occupied with the PS-3100 which he
had also brought.
Now, ironically, I consider using this method when I will build
a keyboard for my PS-3200 clone. (;->)

I think the electronic part is not worth mentioning (super easy).
Amplify and level shift the output voltage of the transducer.

But the mechanical part is difficult. You must find a way to insert
the tube (hose?) beneath the keys, such that it's equally actuated from
blacks's and white's. And, worst of all, you have to find a way to
get enough key travel even with the additional thickness of the
tube. But then again, the SH-2000's keyboard also has reduced 
key travel, and it plays nicely ...

JH.

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