TR25 Foot Switch

[aerome]

Just picked up a '76 TR25 in somewhat decent shape. I didn't get a footswitch, but need some info. Seems like tremelo is always on (I can turn the gain down and stop it) and I hear very little, if no, reverb. I'll hope can be controlled with the footswitches but will ask if anyone knows about this? Also, is the footswitsh just that or is there circuitry involved in it? Lastly if the reverb is T.U., are there replacements out there?

Thanks much!

And thanks to Ethan for the schematic.