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

[CasioRZ1 at aol.com]

and...

What about "fret buzz", where the string accidentally comes into contact 
(even briefly) w/a fret higher up on the fretboard?  Perhaps you could take 
care of this with code if yer using a microprocessor (a note is only valid if 
on longer than Xms, or whatever), or by having really high action ;-)

Unless I miss something about the resistors in series thing, wouldn't you 
have to (again) cut the frets (each note on the fingerboard has it's own 
resistance)?  Unless, I suppose, you made each string a kind of switch, so 
that the resistance of fret 5 on both the E and A string is the same, but 
feeding a different VCO/ADC channel/howeveryergonnadoit... 

Derek

In a message dated 5/15/2000 8:14:01 PM Mountain Daylight Time, 
matti at devo.com writes:

<< Matrix scan? What about just a bunch of resistors in series, the end of 
each of 
 which  is soldered onto a fret (in the neck, probably hollow). That aside, 
won't 
 it's only being able to see that lowest note on each string make a problem? 
What 
 about the resistor/capacitor actions of the fingers?
 
 Quoting Theo <t.hogers at home.nl>:
 
 > Have to see how this works:
 > Give every fret its own voltage, do a matrix scann on the string and
 > frets.
 > No reson to cut up the frets, since you can see what is the "lowest"
 > fret
 > touched by the string.
 > 
 > Just an idea,
 > Cheers Theo "can only play a Amaj"
 > 
 > ----- Original Message -----
 > From: Paul Perry <pfperry at melbpc.org.au>
 > To: Harry Bissell <harrybissell at prodigy.net>
 > Cc: <synth-diy at node12b53.a2000.nl>
 > Sent: Sunday, May 14, 2000 8:15 AM
 > Subject: Re: MIDI-guitar (was: Touch Switches/TS instruments )
 > 
 > 
 > > At 08:59 PM 14/05/00 -0400, Harry Bissell wrote:
 > > >Reply:   no!
 > > >The string is shorted to the fret before AND behind the finger... so
 > if
 > you
 > > >have>fretted strings on any adjacent frets they are shorted together
 > > through the
 > > >X (strings) Y (frets) matrix. You CANNOT isolate the strings once
 > they
 > > >touch>the frets...
 > > >that's why everyone cuts the frets into pieces...
 > >
 > > 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..
 > > >
 > > >Moral: everything easy has been done already !!!
 > >
 > > CounterMoral: think harder already !!!
 > >
 > > paul 'smartarse' perry melbourne australia
 > >
 > 
 
 
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