Would a cheap Danelectro pedal work as an expression pedal for my RP50 or should i save up and get a Boss Metal Zone or a Scott Ian Black 13?
I don't think you can use an external expression pedal to control effects on the RP.
I will show you something different from either
Your shadow in the morning striding behind you
Or your shadow at evening rising to meet you
I will show you fear in a handful of dust