For what it’s worth, I used the NV at 18v, range at 1, heat at 11, and boost at noon, first in the chain and never on its own into a clean amp. After plenty of trial and error this was the set-up providing the least amount of compression, congestion, gain/mud stuff that comes w/stacking drives. But this gave just the sweetest definition to leads, solos, single note stuff. I think with TB boosters, like fuzzes, you take all the advice from everybody and try everything and just keep experimenting b/c when they’re not working TB’s are awful, honky messes. But in the right set-up, they are like nothing else. I used a few different Germanias and yeah they are finicky.