So I went to my local Music-Go-Round to give my friend who works there a CD. Low and behold they had a used BSX EUB (5 string)for only 599... needless to say I suffered major gas and bought it. Now what I don't know is there are 4 knobs and a switch anyone know what they do? 2 seem to be volume and two are center-dentented. The model is a "BSX 2000 Series" (at least thet is what's printed on the side of the bass). Aparently the model must be discontinued, as it's no longer on the BSX website. if anyone out there has one of these and can shed some light on the controls I would really appreciate it.