I have a four-channel Marshall MG102FX amp; will a single channel Marshall PED801 work with it? I just want to be able to go from clean to distortion. Thanks!
Plug it in the footcontroller jack and find out. Certainly couldn't hurt.

My guess would be yes, it should work.
Gibson RD Silverburst w/ Lace Dissonant Aggressors (SOLD)
Electra Omega Prime Ceruse
Fender Franken-Jag Bass

Amps and the like:
Laney VH100R
Seismic Luke 2x12
Dunlop 105Q Wah
Gojira FX 808
Line 6 M9
Lol, ok. I don't have the footcontroller yet. My brother has an extra one (I need one) and he wanted to ship it to me, but I didn't want to pay for the shipping if it wasn't going to work. We figured since they're both Marshalls they should work. Thanks for the quick reply, that was fast!