Discussion about the Korg PolySix synthesizer

hi!! i am glad to find you!!!!

i just bought an old p6 with very small leaking problem after repairing the trace and replacing the ic31 everything looks work fine.....but when i press the unison button and i press note key up for 4 sec i hear a slowly modulation on the sound everything in MG is 0 do you belive the problem is because the voices is out of tuning? this problem not exist on poly mode......

thank you....