Alesis Andromeda A6

Thaks Bob, I trust you a lot. So You think my knobs jittering may be 
solved with your 2 advices:

"verify all power supply voltages are what they need to be and are 
clean, free of noise.  If still intermittent, buy a can of freeze mist 
and with that and the back of a pencil to freeze and tap to find the 
bad connection"

I'm sure my problems are in the front panel left board. 
Probably also with schematics and a tester I don't know where to find 
the power supply of each board and I don't know how much it must be.
If you can Help me, otherwise I'll try with the Freeze Mist.
When you say to tap with the back of the pencil, do you mean a 
machanical action on components?

Thanks a lot Bob!

Stef