Discussion about the Korg PolySix synthesizer

Could someone provide an explanation of how the external filter control input on the back of the Polysix functions that is more specific than the manual?  I'm interested in using my MU format modular synth's LFO to create filter sweeps that are much, much longer than its internal LFO.  In particular, I'd like to know what voltage levels it takes (something like 1V/octave, if applicable) so that I can hopefully approximate the Polysix's LFO 'Level' control by using some sort of signal processor or attenuator on the modular end.  At the moment, really long LFO times end up creating silence about half the time.  Thanks in advance!


Ian MacMillan

Most other Korg equipment from roughly this timeframe expects control
voltages between -5V and +5V for filter control as well.

Negative voltages probably lower the cutoff. Now, depending on the
functionality of the LFO in the modular system you may have an LFO that
ranges from - to + or one that ranges from 0 to + (your description sounds
more like the former).

When the long LFO times create silence it probably means that they lower
the cutoff frequency too much. I would start by turning up the cutoff more
and by attenuating the external LFO.