Korg Poly800/EX800 Users

Spent a bit more time on the FM-800 mod today. The effect only works
when you have high sustain set on the source DCO. I have used a
digital switch to allow selection of either DCO1 or DCO2 but it
doesn't work very well in Single DCO mode because it only modulates
the filter every second note. But we can change that so that an
extended parameter would determine if the source for the modulation
was automatically changed from one to the other DCO according to each
new note playing. Also, I noticed that with the digital pot set to
zero the signal from the DCO gets loaded down by the VCF so I will
have to buffer the signals with opamps before sending into the VCF.

I am still a little bemused with the 12/24db/oct filter since it just
seems to set a lower cutoff and not much else. I would be interested
to hear from other people who have done the 12/24 filter mod to see
how they got best results.

The moog slayer mod I did just bridged out the 10K resistor with
another 10K resistor (thus halving it to 5K). I didn't set up the
digital pot yet. The results are a little scary but workable. I
definitely think a digital pot is the way to go there.

Will keep you all posted as I proceed. And do let me know how you're
all going and any suggestions are always welcome.

Mike.

--- In korgpolyex@yahoogroups.com, "patrioticduo" <patrioticduo@...>
wrote:
>
> Yep today, I successfully built and installed the FM-800 mod with
> digital potentiometer control, the Moog Slayer and the 12/24 db filter
> selector.
> 
> Initially testing was ear piercing squelches from the Moog Slayer.
> Wow, that self oscillation is a real speaker/ear killer.
> 
> The 12/24 db switch I was not that impressed with. Why do people like
> it so much?
> 
> The Fm-800 I have yet to test fully. Hopefully, will get to that over
> the next week or so.
> 
> Mike.
>