[sdiy] pitch tracking / guitar synths

[WeAreAs1 at aol.com]

In a message dated 12/19/05 3:31:31 PM, dave at westphila.net writes:



> As for cleaning up the guitar signal the GR-300 uses a tracking filter
> 
> 

Hello Dave,

I think you're mistaken about there being a tracking filter in the GR-300.  
The circuit for each string has a separate fixed-frequency filter which 
attempts to limit to response of that string channel to just the two octaves (or so) 
that the string produces.  They made no attempt to have the filter frequency 
track the string frequency.

It would sure be nice if the GR-300's audio filter actually did track the 
note you were playing (I'm talking about the resonant filter that you can hear 
and adjust, not the fixed ones that help the P/V converter do its job).  You 
kind of have keep adjusting and fiddling with the filter cutoff frequency as you 
play up and down the neck.  Otherwise, your sound is alternately too buzzy 
(for low notes) or too muted (for high ones).  Unfortunately, the GR only has one 
master filter which filters all six strings simultaneously (kind of like a 
Korg Poly800 or an ARP Omni), so it would be pointless for them to have that 
filter try track your playing.  I guess what I really wish for is a separate 
tracking filter on each string.

Mike B.
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