I'm reading up on all the Enhance / Timbre / Tone Balance / Room Balance / etc., controls and have several questions: How much are they used? Do you move them a lot, and when / why? If you set and forget, where do they get set to? Do you find one more useful than the other? Are Fenders' controls and "better" or "worse" than Edens', or the other ones? They seem to all do about the same thing, and there are a lot of amps that don't have them. Should I look seriously for an amp because it has these, and pass one that doesn't? How useful are they and what are they used for?