My wife really likes her Mic Mechanic. Got it on ebay for $99. It does what it says it does. I used it on a solo gig last week where the house furnished all the amplification and it let my vocals really cut through.

Duane
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Korg PA4x76, Yamaha CP-70 Electric Grand Piano, Zoom L20 mixer/recorder, Turbosound ip500 column speaker system