Duh ! ! !

I have a Manual For Bellco's.

Please PM me your e-mail address and I will send it to you. Page 8 in it shows the 2 different models and where the volume controls are located.

They are either on Circuit Boards attached directly to the two Speakers or on the left Cabinet wall as you look at the Reels, just to the left of the left Reel slightly above it and under a wiring harness that goes from the Cabinet to the Door Frame.

They are on that Printed Circuit Board. Two of them side by side, look like a small rectangular boxes with round knobs on them. They are just under a white rectangular plug on that Board.