I don´t know exactly what those Rocktrons do, but the major thing with enhancers is that they work by splitting the signal into bands and delaying them by very, very tiny amounts of time, basically to keep the bass from eating up the treble at the speaker end and adding brilliance in the process. There can also be various combinations of harmonic distortion, phase shifting and plain old EQ scooping going on too. It´s basically to get a clearer and less dull sound, and for some applications they work great.