Discussion about the Korg PolySix synthesizer

From what you tell I would say it is a problem on the KLM-366, in
the log/lin conversion/tuning section.
Or maybe you have one of the rare "old production" units. Is there
a small add-on board "KLM-396" to the KLM-366?
It could be a lose wire (if "old production") and/or a bad solder
joint.
I can see that you are located in Sweden; maybe you ask Ricard
( http://home.swipnet.se/ricard2/p6index.html ) for technical help.


Peter Andersson wrote:

> Actually, tones are quite stable even during the first 20 minutes, but
> the synth is not in tune generally. Also, an octave is a quite stable
> major 7 interval for the first 20 minutes, until suddenly, the synth
> goes into tune and then the octave is correct as well. I'll check
> tonight if a single generated tone changes a lot during the first 10
> sec.
> 
> All six voices are affected. If I play a chord when it suddenly slides
> out of pitch, all notes follow. It actually sounds like I'm turning
> the pitch wheel. (I disconnected the pitch wheel, btw, just to be sure
> it wasn't playing tricks on me).
> 
> It is not related to the MG setting and I've played around with all
> three - VCA, VCF and VCO. I'm quite sure it's not affected by the
> waveform setting either (whether I use a saw or a pulse) but I'll
> double check that tonight. The PWM setting does not make any
> difference.
> 
> Does this give you any clues? Thanks for helping!
> 
> 
> --- In PolySix@yahoogroups.com, Johannes Hausensteiner <jo.synth@c...>
> wrote:
> 
>>It is not normal that it takes 20 miuntes to tune up. Usually it
>>takes about 10sec to tune and then it is quite stable.
>>Check the following: hold a key down when switching power on. The
>>generated note should change quite a lot until it stabilizes after
>>a few secs.
>>Are all six voice affected? Is the effect related to the MG setting
>>(VCA/VCF/VCO)? Is it related to PWM setting?
>>
>>
>>Peter Andersson wrote:
>>
>>
>>>Hi all,
>>>
>>>I'm the proud new owner of a Polysix. I love it! Can't take my
> 
> hands 
> 
>>>off those knobs - the filters are just great! But I'm having a 
>>>problem with it and I'm hoping someone can tell me what it's
> 
> about 
> 
>>>and maybe even what can be done...
>>>
>>>After I've played the synth for a while, notes start to go out of 
>>>pitch every now and then. It happens randomly every 10-30 sec or
> 
> so. 
> 
>>>The notes go off pitch with a note or so and always jump or slide 
>>>back to the original pitch again within half a second.
>>>
>>>At first I thought it was some filter setting of mine that caused 
>>>it, but as it turns out I get this no matter how the Poly6 is 
>>>programmed (or if I use a preset or a fresh "manual" sound). (By
> 
> the 
> 
>>>way, it takes about 20 minutes for the unit to get in perfect
> 
> tune 
> 
>>>after a cold start. Don't know if that's normal or if it's
> 
> related 
> 
>>>to this problem in any way).
>>>
>>>I'd be truly grateful for any help!
>>>
>>>Peter
>>>
>>>
>>>
>>>
>>>PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
>>>
>>>
>>>Yahoo! Groups Links
>>>
>>>To visit your group on the web, go to:
>>> http://groups.yahoo.com/group/PolySix/
>>>
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>>>
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>>>
>>>
>>>
>>>
> 
> 
> 
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> 
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> 
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> 
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> 
> 
> 
>