Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

I've been working on adding these three exact knobs. I haven't yet
gotten an exactly perfect run yet, not enough time you see, but I've
more or less figured out what I'm doing with it.

LFO rate: replace the entire unit with a single op-amp lfo, using the
existing buffer on the chip. I'd like to use an Oscilliscope to make
sure the replacement has the same levels, but mine just died.

Quick hack: add a 10k to 100k knob in series with R60, and put a 1uf
or so capacitor in parallel with C45. Make sure you don't use something
polarized. Rate varies from a few hz lower then original to annoyingly
fast.

Feedback: buffer the signal at pin 14 of IC3 with an opamp, put it back
in at pin 7. Haven't tried this yet.

Wet/Dry mix: Replace R23 and R28 with 1k or so resistors in series with
a dual-ganged 10k audio taper pot. Wire it up so that they fade opposite
of each other. Again, haven't done this yet, but for a quick hack put a
10k-100k or so pot in series with C26 to kill the level of the original
signal. Has an effect on volume when you switch the chorus off, but gets
the job done when it's on.


I plan on making a web page detailing the mod for the electronics inexpirenced,
but I'll get to that when I finish it. I've been busy lately, finals just
around the corner.