[sdiy] Prophet 5 Poly-Mod / Filter Env calibration

[Gil W.]

Hello friends !

Have a small question. Since I got it, my P5 acts the following way -

Under the Poly-Mod section if I set the Filter Env pot to minimum,
and select the Freq A button ON, then on the Filter Env section set Attack, Decay and Release to minimum,
turning the Sustain knob up and down, the pitch of Osc A changes as expected,
but one voice will always sound too sharp and out of tune in respect to the other four.

I wonder what should be re-set, or which trimpot is responsible for this.
 see the following trimpot but unsure which one to set:

P-Mod Env Balance (for all 5 voices)
Filter Balance (for all 5 voices)
Filter Scale (for all 5 voices)
P Mod Osc Balance

Thanks for any advice !