hex guitar pickup?

[Thomas Hudson]

The Roland GK2 pickup that is used with all newer Roland Guitar
synths can be used as an audio source. In their physical modeling
system they take audio from this. I think the signal levels are
quite low. I believe it requires a +/- 7.5 volt supply. This
has been a back-burner project for me (once I get enough modules
in my modular). 

I think the GK2 can also be used with the older Roland GR-300 systems.
These things track better than any of Rolands current products, but
I've never seen a schematic. All the newer products seem to have
trouble filtering out the second harmonic. You get this momentary
jump up an octave and back down. I've often toyed with various adaptive
filtering schemes, but I would love to see what Roland did in the
GR-300.

Of course if you can get the filtering right then you have to convert
from exponential to linear if you want to use v/oct gear. I believe the 
GR-300 VCOs are linear response, thus eliminating the need to convert
from
exponential.

If anyone has done any work in this area I would be interested also.
I may be able to find the pinouts for the GK2, I have a manual
somewhere.

Thomas


Paul Perry wrote:
> 
> an analog jazz impro kinda guy has asked me about making an analog controller
> from his guitar... I was thinking something like the early GR-300 Roland thing,
> but modern technology... does anyone know whether the little stepped flat
> pickup thing
> that comes with modern Roland midi guitar systems is a hex pickup that can
> be used
> to source signals for this? I don't want to get involved in midi at all on
> this one
> and i dont want to physically hack the guitar.
> 
> paul perry melbounre australia