Just this past weekend I puchased a very nice used Axcelerator. Since a haven't had an active bass since the early 80's, I have a question on the controls for this thing. Mine has what apeers to be a standard volume knob, a satndard tone knob and then a pair of stacked knobs. So what are these supposed to do? I have been unable to find a manual for this bass on the Peavey archives. Also what can be expected for battery life on this instrument? Thanking you in advance for your assistance.