Yep, the 2 1/4-inch plugs should be mono, and the 1/8-inch plug should be stereo. Radio Shack does not have this cable, and they do not carry effects cables either. I've never seen one in a music store and suspect you'll have to have it custom made.

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.)