I managed to pick up a second hand Electro Harmonix Q-tron + for a very tidy sum the other day. I'm using it with my bass, but whatever settings I use it just sounds muffled, unless I put it on high pass mode then there's no bass.

Do you think there's something wrong with my pedal or is it just me not using very good settings?

'97 Modulus Flea Bass w/ Lane Poor
Warwick Corvette Bubinga

Gallien Krueger 700RB-II
GK 210 RBH
EB Volume Pedal, EHX Black Finger, EHX POG, Malekko B:Assmaster Germanium, EHX Holy Grail, KORG Pitch Black