MIDI-guitar (was: Touch Switches/TS instruments )

[Ingo Debus]

Harry Bissell wrote:

> Other people have tried the resistance of the string, constant current, etc.

Why doesn't this work? Seems quite simple to me: make strings of
resistive wire (Konstantan etc.), connect all frets to ground, insulate
the strings from each other and measure the resistance between end of
the string (at the bridge) and ground. Maybe problems with bad contact
between frets and strings?

Paul Perry wrote:

>Yeah, but, since the two frets are adjacent, you just need a bit of
logic to
>say, 'hey the 3rd string touches fret n and n+1, that means n'
>Now, you're going to come up with a counter example where there are more
>than one 
>touching the same fret.. but, given that there are only 6 strings &
they are
>only being fretted at a maximum of two adjacent points.. 

Like for a conventional switch matrix, this would require a diode in
series with each "switch". Maybe the strings and frets can be made of
semiconductor, strings p-doped and frets n-doped? ;-)

Ingo