Hello,

My beloved Mono/Poly recently started to develop a warbling seemingly-random filter "drop out" sound. These artifacts are noticeable when playing the VCO's, but are most noticeable when bringing the LPF into self-oscillation -- at which point dramatic shifts in pitch occur.

I must admit, the random warbling sounds pretty awesome, in its own right, but it is driving me crazy that I cannot shut it off. The pure tone of my oscillators can no longer be achieved or held for any period of time.

How does one recalibrate the filter section Is it a particularly difficult or involved procedure Do you have the documentation on doing this in a PDF form

I am, by no means, an electronics expert. I have done some simple things to my Korg over the 15 years of my owning it, like cleaning contacts, wire repair, etc, but have not needed to replace any components yet. Hopefully this filter recalibration will do the trick though!

Thanks for your guidance,

-Kaleb


PS

Additionally, there are some screws missing (from the front knob surface, which keeps it down, and also from the bottom, for securing the keyboard/pitch wheel components. Any idea of where I can purchase these specific screws Or other components, like scratchy pot replacement