BE- Basic crunch overdrive. Anything from classic rock to vh territory. It has about double the gain of say a stock 800/ jmp. Can get all sorts of plexi tones but has the ability of more gain.
C45- Similar to the BE but with a slightly smoother tone and just a tad more gain. Really just a different voicing.
HBE- adds a extra gain stage to the BE. Sort of like the BE was being pushed with a pedal. Gobs of gain with still retaining the British voice.
SAT- Is a diode clipping circuit. Adds gain sort of 80's metal kind of thing. Mainly to be used with the BE channel.
JBE- to be used with the SAT and the BE shifts the low end to a lower frequency and make the tone heavier .
FAT- adds more lows to the preamp. Good for strats and tele's.
Effects loop- well self explanatory .
SIMPLE CLEAN- single knob clean with no eq and a bright switch. Sort of like a normal channel of a Vox. Presence still works with the clean.
FULLCLEAN- Clean with a full eq in the blackface vein.