My bass player recently got a Markbass Little Mark Tube 800. He wanted to compress his signal so we tried an MXR M87 in the effects loop. It didn't seem to make much of a difference. After doing a little research I see the effects loop is set from the factory as Parallel. How do you guys run a compressor with this amp? Do you run it between the bass & the input? or in the effects loop modified to be serial?