Hi

Brinkmann Music wrote:

> I have a Korg Mono/Poly MP-4. I was able to tune each Osc on Circuit
> board KLM-398. However, as you ascend the keyboard up from the
> lowest note to highest note, the pitch drifts up almost a 1/4 step or
> so on all 4 oscs. This is even on all and the same. So, playing
> octaves sounds a bit off. The manual says tune from the middle
> octave, perhaps a "stretch" tuning is deliberate

Check the CV at the CV-Out; if this does not read V/Octave, then adjust
VR2 on the processor board (KLM-356). If this reads correct V/Oct it
would become ugly.

> Also, noticed after repeated playing of octaves that perhaps one out
> of four repetitions will yield a pitch that is a bit off tune on just
> one of the osc.

Does it happen also in unisono mode or only in polymode

> There is no pattern here, it is random as to which
> osc is out of tune and when.

If in polymode you should easy find out whether it is a dedicated
oscillator by turning down the volume of one oscillator after the other

> Lastly, some times if you play two notes together in POLY mode, and
> then quickly play a single note or let off the first note, you hear
> the note you just let off sound when you play the next single note.
> Like a double voice trigger. Changing release times and sustain
> doesn't stop this behavior. Maybe it is the auto damp function
> acting up

Sounds like the normal behaviour of autodamp with multiple trigger on.

Florian