Guitar - Guitar effects processor (pedal) to amp, 4-cable method

1. Cable 1: Guitar's output -> Pedal's* input
2. Cable 2: Pedal's output -> Amp's return
3. Cable 3: Pedal's loop send -> Amp's input
4. Cable 4: Pedal's loop return -> Amp's loop send

* Pedal: Guitar Effects Processor.
** Guitar effects processor (pedal) to amp, four-cable method.