I was reading the manual on the Mutronics Mutator but I'm not quite sure what the MIDI IN, THRU and BASE CHANNEL features do. I was thinking that MIDI IN and THRU was for the syncing of the LFO via a MASTER but I'm not sure if that is correct. If I had one of these things I'd experiment and figure it out for myself but these are quite rare these days and they go for exorbitant prices.
Also, I'm unsure of what the BASE CHANNEL does exactly, could anyone enlighten me on that also please?
The link to the manual is here for reference (P.3):