I play a '75 Fender P bass through a SWR WorkingMans 15 with a Working Pro 15 extension cabinet. From the bass I go into a Boss C-3 Compressor/Sustainer then into a Ampeg Scrambler pre-amp. Ever since I started using the compression, the high notes (D and G string) have no punch. Tried various setting on the compressor, still get no high end punch. Any suggestions would be greatly appreciated.