Discussion about the Korg PolySix synthesizer

--- In PolySix@yahoogroups.com, Malte Rogacki <gacki@...> wrote:
>
> At 14:10 Uhr +0000 09.02.2012, sigma.draconis wrote:
> > For some reason I don't get, for me, expected results.
> > What should the waveform look like?
> 
> Pretty much like a sine wave, regardless of the frequency.

Yes, that makes sence to me to.
I just fixed a Juno-106 (my other hobby project) with broken voice and the calibrating of the filters was just as you describe.
Sine waves within accepteble parameters.

That's why I thinking, I'm doing something completely wrong...

> > I can get with turning the pots to something looking like triangels pointing
> > to the right.
> > (Starting long side left and getting shorter to the right, until zero)
> So it looks more like a sawtooth? This definitely should not happen.

Yes, maybe you're right, but then a modulated sawtooth.
A bitt difficult to discribe.
 
> Does the Polysix work otherwise? Basically this is just the filter
> calibration we're talking about; so do the unfiltered sounds (for example
> sawtooth or square) sound ok?

Yes, without the filters it sound nice, and also in tune.

When I got this PolySix, it was a completely disaster.
The battery was leaked in almost the worst possibillity, and coroded 2 PCB's, also everything was way out off tune.
I cleaned everything. fixed the PCB's changed a few parts, and did all the tuning, except the filter tuning, for some reason, I didn't get it, or understand it.
Every other function works OK, but you can hear the filters are not correct tuned.

I'm not in a hurry, it's just a hobby, but it would be nice, if I can fix it :)