[sdiy] Velocity Sensitivity Retrofit

[Rainer Buchty]

On Wed, 27 Feb 2008, Kyle Stephens wrote:

> Out of idle curiosity, has anyone tried cannibalizing
> an otherwise stock, non-MIDI keyboard and making it a
> CV interface *with* velocity sensitivity?

Go for the Ensoniq way: place an open coil under each key, which the key 
itself will then "tune", therefore changing the oscillator frequency, 
the coil is part of.

Takes some slightly more processing power (which is why Ensoniq used a 
dedicated counter chip for that), but not only gives you velocity but 
also aftertouch.

The patent should have been expired by now, so even (semi-)commercial 
use should be possible without licensing worries.

Rainer