Scott,
If you're not getting good mids and highs from the system, it sounds as if the keyboard's EQs should be tuned. Try the smiley face setup I posted at Joe Waters' site and see if this doesn't make a big difference.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)