Cab block Preamp defaults to none?


Does this always default to none? How do you guys run yours? I'm not really finding much info on this. I'm using a Friedman Be VI with a 4x12 Fractal GB M160. Any advice on that one in particular?
Its just one of like 20 different spots where you can dial in a little tone shaping.

I used it a lot when it was introduced but honestly haven't messed with it in ages.
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