you can find the explanation here:
http://cometalabs.blogspot.com/Audio Input:
Drill a hole and add a "normally closed" jack. This will be your audio
in jack. Desolder the + lead of cap C24 from the circuit board. Add a
wire from the desoldered lead to the tip of the jack. Then, solder a
wire from the empty hole where the cap used to be, to the normally
closed lug of the jack. The final step is to solder a wire from the
ground lug to a suitable ground spot on the pcb. Done!
--- In korgpolyex@yahoogroups.com, "satnom2000" <satnomb@...> wrote:
>
> audio in to VCF (thru EG3)...
>
> Hi David
>
> I'm interested to know a little bit more about this audio in mod. Do
> you have schematic or something that you can share with this group?
> It will be much appreciated.
>
> Thanks
> Bernard
>