[sdiy] Release Velocity & Poly Aftertouch -- Too Much?

[Rainer Buchty]

> I like the idea too.  Other options are optical or magnetic readout of 
> key position.  "Leveling" (getting all the keys to respond the same) 
> is the biggest problem.

Could be done a similar way to the Ensoniq approach. Do a 
whatever-frequency conversion and then determine the default value for 
each key. Should work, if all keys at least have (somewhat) identical 
responses.

> Maybe the capacitive approach would have some advantage there. 
> Magnetic is probably the most sensitive technique because of the 1/r^4 
> dependence, but linear Hall sensors are still fairly expensive.

Now for the DIY approach: Would it be possible to convert an average 
keyboard using one of these methods, or better: has someone done it yet?

I have several spare keyboards which just deliver velocity but don't 
have any means of getting pressure response.

Rainer