#3
as long as its is one of those 1/4 stereo type jacks. I believe Marshall amps use a similar footswitch for the two channel combos. You can get the vox ones from guitarcenter or samash or pretty much anywhere that sells the AD series.
Ibanez SR-500
Schecter C1 Blackjack
Ibanez GSR200
Classical acoustic

G&K Backline 600 + Goldline 210GLX cab
Vox AD30VT
Crate G40C XL
Crate BT15
EH Metal Muff
Digitech Grunge
Danelectro Fab Overdrive
M-Audio Ozonic
Tascam M-308