Korg Poly800 cutoff & res knobs???

[>>>marjan<<<]

> > Anyone ever added pots to the Poly800 to add realtime cutoff & resonance? I
> > found a site that explains how...
> >
> > Just curious if this mod is worth it or not?


I've tried cutoff and res mods and they work just fine giving you
nice realtime control, but they affect all your patches so you
need to adjust them every time (someone once had idea to place switch
to chose between internal preset trimpots and ext pots so you can
always call back original settings, something I intend to do in mine
in future), res mod makes VCF selfoscilating (it didn't in original)
on highest settings.
VCF on mine was too "dark" (closed) so this mod gives some nice
new timbres. You can make lower vcf parameter settings in all
patches so you can control full range with pots.

There's enough room to put 4 minipots on upper left side
so I planned to make FM level from osc to VCF but I don't
have access to scope righ now so if anyone have scans
of poly 800 schematics I would be very grateful if someone
sends them 

I also had idea to use CV for filter as control and 
to make little EXOR ringmod (like in ms20) if there are
two separate outs for osillators

There are also trimpots for osc freq and noise level

Also I remember someone was developing better interface
for its parameter incr/decr (rotary switch?) some time
ago.What happened with that project?
 
> I added the cutoff pot to the poly 800 (haven't gotten around to the
> resonance knob though....  It works well, except that it kind of
> de-stabilizes the oscillator at the very high end of the 100 k variable
> resistor.   

I didn't notice such effect on mine. Maybe effect from osillating VCF?

>Nifty, though I dont use the poly 800 much... I was kind of
> 'experimenting' by connecting random chip pins when I had it apart and
> kind of wiped the memory, and I havent gotten around to re-loading from my
> save-tape (which is currently lost...)

Try this for wavs of factory tapes:

http://www.geocities.com/SunsetStrip/Studio/3507/poly8wav.zip
http://home.c2i.net/iotech/patch/index.htm


marjan