This is the size difference according to Pedal Playground with an MC-6 Pro, and according to the specs, it would weigh about 3 pounds less than the FM9. I guess if you added in a pedalboard to that, then you would be getting closer to the same weight. This gives you a lot more modularity if you wanted to just use some of the components in certain situations, and also gives you a lot more MIDI/switching capabilities (I like to use foot switches to control my DAW, and use the on-board relay for switching amp channels).
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