The B|Amp is a great tool to get more comfortable with frequency adjustments! Play around with it. For example, you could keep everything flat, and boost one of the four knobs say 4db. Then go in the menu and change the frequency of that knob, and keep notes of the frequencies you preferred boosted. Do that for all four knobs in their frequency range, and do it all over again with each knob cut 4db. Combine what you liked boosted/cut and that should take you at least to the ballpark of a tone you like.