Ok, this may be a stupid question, but i recently bought my first electric bass (had been playing acoustic), and am worried that the treble boost/cut on the 3-band EQ is not working. While turning the knob, an odd swishing sort of noise comes from the amp, and when the bass and mid are cut, there doesnt seem to be any difference in tone or volume at all when i boost the treble from 0 to full, even when i turn the treble up on the amp. The tone seems to get slightly brighter, but it is very hard to tell for sure. I am also playing on a crappy old practice amp, which i suppose could be the problem. Is it normal for treble boost to do so little in terms of altering the overall tone? Could it be the amp? any help would be greatly appreciated, thanks!