Discussion about the Korg PolySix synthesizer

Hi TR,

As suggested by CJP you might have a problem with the VCA circuit. 
The VCA heart is an SSM2056 chip which is at position IC34 on the 
voice board (KLM-366) on the right-hand side with the top panel up. 
As an initial check you could try switching the VCA chips from one 
voice to another as they are socketed and can be removed without 
soldering. There are six in total, one for each voice. If you swap 
one and the problem shifts from one voice to another then this might 
be the issue. However, if you own an osciloscope (or know someone who 
does) I would suggest you check the VCA adjustment in the service 
manual (let me know if you can't find a copy). This involves 
adjustment of pot VR9 and comparing output waveforms. If you find you 
need to replace IC34 I have seen them for sale on eBay or you could 
try my old friend Senso at vintageplanet.nl

Also, the SSM series chips are CMOS based and sensitive to static 
electricity. Make sure you take the precautions to earth yourself 
before handling the internals. Drop us a line if you need any more 
help...

Cheers,
Andy

--- In PolySix@yahoogroups.com, "toerag_man" <toerag_man@...> wrote:
>
> Hi, 
> 
> Every sixth note I play is louder than the rest. Is this a common
> problem? Easy to fix?
> 
> Thanks,
> TR
>