All of my instrument cables are heavy-duty, sheilded cables and all are contained within a single harness. All of my power cables are very short, most are wall warts and all are housed within a custom made compartment that fits in front of the keyboard. The main power cable that goes to the wall is a heavy-duty, 14-gauge, grounded cord that is connected to a heavy-duty surge protector. No noise problems whatsoever.
Cheers,
Gary
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Travlin' Easy
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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.)