[sdiy] req : midi guitar info

[Scott Gravenhorst]

I'd be interested in the comments of others...

The system I use does not produce analogue outs...  It's
a MIDI guitar system.  (and the question was about MIDI
guitar)

First, a whole lot of this has to do with how you play
it.  I've heard other people do stuff with my equipment
that I can't seem to do.  So I won't claim to be a good
guitar player or a good MIDI guitar player.  My problem
is having a ham fist, heavy hand.

What I can relate is what I've read about the system I
use and some things I've done to optimize it for me.

First the system I use is a GR-50 synth with a GK-2 pickup
system.

It is designed to approximate the pitch of a picked string
by measuring dv/dt for the first quarter cycle.  The GR50
synth will then start the attack portion of the sound with 
that rough pitch measurment.  As time goes by, more precise
measurment is made by cycle counting and the rest of the 
sound time is pitch corrected.  The MIDI messages associated
with this are a burst of MIDI pitch wheel messages (if MIDI
is enabled).  I wrote some software to analyse this data and
found that picking strategy is important.  

I have never found using this instrument very useful for 
recording MIDI messages.  There's just too much dirt.  For
me and my ham fisted wanker technique though, it is useful
(for me) to do pad chords.

As far as optmimizing it, I did this: (and I got the idea
from a guy's posting on some newsgroup)

I replaced the lowest 2 strings with ones that are 1/2 the
diameter (hence tuned up an octave).  This speeds up the
(ordinarily) late response of those strings, although it does 
require that you change the pitch programming of the sounds you 
use to compensate for the octave shift.  I also discovered that 
this almost "nashville" tuning is something I like...  But that's 
something else.

Make the string height to pickup adjustments as close as 
you can.

I hope that wasn't too off topic....




"criss m" <moog at sick.cl> wrote:
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>hi guys=20
>
>im back after some nice vacation :) and i was wondering if somene can =
>provide me some links or info about midi guitars (i dont know much about =
>it)=20
>but=20
>i dont know if there are units that translate a analogic signal from the =
>guitar (electric) and translate into midi mensages??????
>
>or if there other sort of midi gitars with switchs or sensors in the =
>bridge?
>
>i just build a  midi keyboard and noticed that ima keyboard fool.... its =
>hard for me , i think i'll buy piano for dummies....
>
>please help


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