I've got one of the older Tobias Growlers, with the single volume, balance, two stacked bass/treble controls and two toggle switches. My understanding is that the pickup and EQ are from Bartolini. My problem is that this bass no longer has any power to it, no "oomph". The controls all operate as they are supposed to, but the whole thing just lacks the powerful output it had when I bought it. I've replaced the batteries and changed strings (obvious and simple), but it didn't do much. Anything else I should be checking? Does anyone have a wiring diagram for this rats nest? It might give me a clue what to check, even though the controls are working. If that fails, does anyone have a good replacement recommendation?