I recently acquired a used Modulus Quantum Q5 from a Guitar Center, and I really love out it plays and sounds. However, it didn't come with much information about the specs. The description that came from GC was "2000 Q5 Quantum 5 String Trans Amber Electric Bass Guitar". It has EMG X active pickups. Does the amber have to do with the finish on top or somehow in the body? Do you know what other wood may be in there? Also, I'm not sure what this double knob (left most -on photo) does. It seems like the bottom part only does something when the top part is turned up. The other double knob seems to be a treble/bass knob. Does anyone have any insight on what the specs would be on this bass? Do you know what that double knob represents? Thanks in advance.