smoothly, the tenth it will oscilate about 1 or 2 encoder counts so
rapidly it makes a buzzing noise.

Correction..its probably Loop gain on your amp

This might..might give you some ideas of where to start and how to do
it. Maybe.


http://www.omni-turn.com/Pages/Techn...djustment.html



BINGO!

I'M SURE THIS IS IT. Only ran this machine ten years now with this
problem. Never adjusted this pot.

Karl