Mark II B confusion

[David B]

I just picked up a 1980 Mark II B. Everything seems to work well. I was wondering if anyone can help answer some questions. It came with a couple of foot switches One with a red light (for distortion/clean) The other is marked EQ and Gain with one input. I have no clue where to plug in. Also, I noticed two 1/4 inch jacks under the chassis, any idea what for? The reverb works fine but I would like to switch on/off. Is that possible with a foot switch? I found the so called manual but it doesn't help.
I would appreciate any help.

 

[MisterMojo]

The dual foot switch plugs into the right 1/4” jack on the right (IIRC, as you look from the back of the chassis). Need to use a stereo ring tip cable for that one.

 

[David B]

Thanks, that works! Any idea what the other jack is for?