Don hit all the problem areas I would have suspected as well. While I suspect it's not the mic, it's always a good idea to try another mic--just to be on the safe side.

Good Luck,

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.)