My friend just got a Fender JBS off of ebay and we can't figure out what all the knobs and switches do. Here's the bass: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2529054787&category=33039 The knob closest to the neck is a master volume, and the bigger switch on the bottom is a 3 position pickup selector. The other smaller switch is a 3 position switch, but I can't figure out exactly what it does. The knob on the bottom has a center detent, and the other doesn't. The two knobs seem like they might be treble and bass boost/cut, but depending on the position of the smaller 3 position switch the effect they have is different. Anyone know what the controls do?