The Kawai & Teisco Analog Synths Group

Hello!

My SX-210 works well except one thing:
Decay of the one voice is dead (no sound), but if i set it to "0", and sustain to "99" - it sound just like other ones..
There is some little pots inside (near every SSM filter) - what do they do?
And maybe someone know what chip and/or resistors control VCA or decay?

Thanks in advance!

Btw. i can post here presets from my SX (i recorded them n WAV when it arrived, and i think is a factory presets:)
I tested file on my own SX many times and it works just well!

XOR