I have a Fender Bassman 25 and on the front there is a button that says "Enhance" on it. I can hear a diffrens, but what is it for, and what is the diffrens? (Sorry 4 the stupid question, but hey, nobody'z perfect)
I beleive it is just an upper harmonic boost; i.e., it takes some of the upper frequencies and gives them a little boost, just like taking a slide rona graphic eq and pushing it up a little. It can help add presence and clarity, and even help cut a little bit.
I believe it scoops away the mids, so that the low fundamental tones are enhanced and the highs are made clearer. Good for slapping.
It probably does what phil says, but so what? Just turn the danged knob until you like what you hear.