Discussion about the Korg PolySix synthesizer

Thanks for the quick reply.

Ok, so I adjust the KBD Track control panel knob so that I get +1.8V
on CN05-06 and then adjust the KBD Track trimpot to get as close to an
equal tempered keyboard as I can?

LC

--- In PolySix@yahoogroups.com, Johannes Hausensteiner <johau@...> wrote:
>
>  > But when I went to the manual, it says to test CN05-06 (which I take
>  > to mean Connector 5, Pin 6) and make sure you get +1.8V. When I test
> This means that you have to adjust the KBD Track control panel knob
> so that you read 1.8V at the connector and then make any trimpot
> adjustments with this setting.
> The adjustment procedure is part of the official Korg Polysix service
> manual; there should be no error in it. The VCO alignment section
> can be done faster and more accurate (by tuning the voices to each other
> not each voice independently), but the filter section is OK.
> ... But the filter CF is not that accurate to regularily "tune" them
> and play them as additional oscillators. You will end up in a mistuned
> or "honkey tonkey" sound.
> 
> The offset pot (VR7) sets the audio signal offset (= eliminating DC
> component in audio), whereas "Filter F0" (VR8) sets the center frequency
> of the VCF.
> 
> Good luck!
> 
> Johannes
> 
> 
> 
> lionelcassin wrote:
> > I managed to cobble together a working Polysix from 2 dead units and a
> > rebuilt 367 from Old Crow. The oscillators sound pretty in tune, so I
> > left them alone.
> > 
> > I'm a big fan of self-oscillating resonant filters, so I fiddled
> > around with the frequency filter VRs to get all the filters tuned to
> > the same note. Then I screwed around with the KBD TRACK (VR5) and KBD
> > TRACK OFFSET (VR13) on the 367, knowing that if I sent everything
> > screwy, I could refer back to the calibration manual I downloaded from
> > Old Crow's site. 
> > 
> > But when I went to the manual, it says to test CN05-06 (which I take
> > to mean Connector 5, Pin 6) and make sure you get +1.8V. When I test
> > that pin, I get anywhere from -5 to +5 volts depending on the setting
> > of Keyboard Track pot on the front panel. The manual doesn't mention
> > KBD OFFSET.
> > 
> > So my KBD TRACK, KBD OFFSET and FILTER F0 and OFFSET pots are probably
> > set way out of factory standard and I have no way to get home.
> > 
> > Thus my questions - 
> > 
> > 1. Is the calibration manual off the Old Crow site the right manual to
> > use for a 366B? If not, where can I get the right one? 
> > 
> > 2. If the calibration manual I have is the right one, what am I doing
> > wrong?
> > 
> > 3. Can one get tuned filters over the entire keyboard range, or is
> > that practically impossible? The best I get was 1 - 2 octaves in tune.
> > It sounds ok, but it could be better.
> > 
> > 4. What is the difference between VR7 (filter offset) and VR8
(filter f0)?
> > 
> > My overriding goal is to get the unit back to factory standard. Any
> > help towards that end would be much appreciated. 
> > 
> > Thanks
> > Lionel Cassin
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> >
>