Switch to LO and HI in the effect loop. When loop not engaged, switching to LO offers yet another tone option. Please note the volume drop. Effect loop SEND - connection to the output of the effect pedal. George Dennis can supply module as an option.
Balanced output enables a connection to a mixing console.
Speaker output 16 Ohm. 1x8 Ohm and 2x16 Ohm. The foot pedal is connected to the amplifier via a stereo shielded cable. This cable also provides necessary voltage for an inbuilt processor. In case of a cable damage or foot switch malfunction you can fashion a new cable by observing the proper solder points on the damaged original.