i want to build a foot switch for my roland cube 20x that would be able to go from clean to overdrive, and if possible also to run the effects but thats not such a big deal to me, does anyone have a schematic for this??
As far as I know the effects aren't footswitchable on that amp. But to switch the channel I think you just have to connect the two wires inside a mono cable. I bought a random mono input jack and soldered it to a position-fixing switch inside a tincan which I painted golden to suit with the Marshall in my bandroom - and it worked Not exactly sure if it will work with a Roland though.

Check this out, too: http://www.youtube.com/watch?v=RqB0v9ymt-U