Pressure sensitive computer keyboards have been used as MIDI keyboards for a while.
But old computer keyboards (those qwerty computer keyboards), there are still have some life left for them.
Computer keyboard developers from Microsoft hardware division built this keyboard prototype as membrane layers were used with resistive coating plus keyboard to get the analog data converted to use.
Every key can register up to 8 pressure levels on it.
Check out the following vid, it shows how this computer keyboard works. via Procrastineering







