Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer

Hello,

This is my first posting - I've recently become the owner of a
slightly battered Korg Polysix. Everything seems to be working ok
memories, controls etc (although the battery mod will need carrying
out), the problem is the way it sounds.
Although the machine basically seems to be in tune, it seems that
some sort of high frequency modulation has been superimposed on all
the oscillators – viewing the output on an oscilloscope shows
this to be the case, all six voices behave the same, so I think that
the fault lies on the pitch CV generation. This modulation is not
related to the MG.
Looking at R152 on each voice block with the `scope shows a
sawtooth wave, should this be a level DC value? Also the waveform at
the V/Oct test point has a large step in it even with all six voices
at the same pitch.
Has anybody got any suggestions of what may be causing this, and
where to start checking.

Regards

Adam