[sdiy] Aftertouch via Pressure

[Speth, John]

> >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 ...
> 
> Agreed.  This sounds pretty challenging.  You also have to 
> have a perfect 
> pressure seal.  And you may have to think some about 
> atmospheric pressure 
> variations if you use air for the pressure fluid.

Use and old tried and true method for black vs. white keys: Use two tubes (one for black and one for white) and calibrate out the differences.

John Speth