[sdiy-interim] MIDI guitar, the hard way

[harrybissell at copper.net]

Nice but no cigar...

The strings will STILL short because the
contact at the frets carries them across as soon
as you finger them...

Think of strings as being conductive in the Y axis and the
frets conductinve in the x axis... as soon as you finger
a string, you contacted two frets... finger a second string
on an adjacent fret and you create the ball of string..

You have the one advantage that you do not expect the
thing to still be a guitar

H^) harry





>
>
>---- Original Message ----
>From: dave at westphila.net
>To: harrybissell at copper.net
>Subject: Re: [sdiy-interim] MIDI guitar, the hard way
>Date: Mon, 26 Mar 2007 12:01:11 -0400
>
>>I think the solution here is to isolate the strings from each other
>at
>>the bridge and at any other metal pieces (tailpiece).  I had a 70's
>>Gibson ES-150DC that had nylon saddles in the bridge which would
>solve
>>the bridge problem.  The tailpiece issue remains....
>>
>>harrybissell at copper.net wrote:
>>> Don't know if this is obvious but your
>>> string / fret switch must be monophonic
>>> (you can only fret one string at a time)
>>> 
>>> The issue is that the strings make TWO
>>> contacts, one toward the bridge, and another
>>> toward the nut.
>>> 
>>> Play any chord and you will see that most of them
>>> would short a number of strings across a number
>>> of frets... making an almost undecipherable mess.
>>> 
>>> Roland has a patent using current transformers
>>> build into the frets that might possibly work well
>>> but would be hell for a DIY approach.  Might use
>>> Hall effect these days, still tough....
>>> 
>>> I'd look for a old G-Vox hex guitar pickup, used.
>>> Cheapest way I can think of to get the amplitude
>>> sensing...
>>> 
>>> And if the system is really monophonic... why not use the
>>> main pickups for amplitude ?
>>> 
>>> Its a really tough problem, that is why it has not been
>commercially
>>> successful (yet)
>>> 
>>> H^) harry
>>> 
>>> 
>>> 
>>>>
>>>>
>>>> ---- Original Message ----
>>>> From: torpedo at demadrid.com
>>>> To: synth-diy at vermine.org
>>>> Subject: RE: [sdiy-interim] MIDI guitar, the hard way
>>>> Date: Mon, 26 Mar 2007 08:10:55 -0700
>>>>
>>>>> So... Now for a crazy idea that hopefully I will be able to work
>on
>>>> whenever I finish the other 20 projects in the list:
>>>>> I have this korean made Les Paul style guitar which I want to
>become
>>>> something useful. I thought about different artistic ways of
>using it
>>>> and finally I realized it was born to be a MIDI guitar controler,
>but
>>>> not the usual MIDI guitar with expensive Roland pitch to midi
>>>> hardware. My thought was to connect every fret and every string
>to an
>>>> AVR/PIC microprocessor, creating a matrix of switches between
>strings
>>>> and frets. That by it self will make of my guitar a pretty cool
>synth
>>>> controler (I know, no string bending... oh well) however, I will
>also
>>>> like to be able to sense individual string strumming. I though
>about
>>>> it and the only solution I found is using an Hex pickup (magnetic
>or
>>>> piezo). Can you guys think of another solution for detecting
>>>> individual string strumming? hopefully something DIY and cheap?
>Once
>>>> the guitar/controler is finished, it does not necesary have to
>sound
>>>> right when the strings are strummed.
>>>>> Would something like this work (from Dave_B in the diystompboxes
>>>> forum):
>>>>> http://davebales.com/me/stompboxStuff/hex_pickup.jpg
>>>>>
>>>>> Notes from Dave_B:
>>>>> "Could it look something like this?  I left out the wires and
>guitar
>>>> strings for clarity.  The white and gold part is the cut piezo,
>the
>>>> black part underneath is foam rubber or something similar.  I've
>seen
>>>> articles about glueing whole peizos to guitars for pickups (and
>tried
>>>> with some success a long time ago).  If you put these close to
>the
>>>> strings would it be enough to keep them from triggering notes
>from
>>>> adjacent strings?"
>>>>>
>>>>> Have in mind that I am not expecting to capture sound out of the
>>>> piezos, only the amplitude of the strumming.
>>>>> Thanks,
>>>>>
>>>>> Gorka
>>>>>
>>>>> _____________________________________________________________
>>>>> www.deMadrid.com , el correo gratuito de Madrid. 25 Mb de
>espacio.
>>>>>
>>>>>
>____________________________________________________________________
>>>> _
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>>>> y
>>> 
>>> 
>>> 
>>>
>_____________________________________________________________________
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>diy



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