The equaliser section allows you to change the tone of the sound on each input. An EQ is normally split into "bands", which control a range of frequencies, in a similar fashion to the treble and bass tone controls on your Hi-Fi. Indeed a simple "2 band" EQ is little more than an input treble and bass control. The more bands an EQ has the more sophisticated it is. SX has a 3 band EQ, with a separate control for the middle audio frequencies. This control is also "swept" which provides even more sophistication. Simply described, a sweep EQ allows you to choose the exact frequency to cut and boost, rather than having it chosen for you, as on normal "fixed" controls.