Jim, you shouldn't have a feedback problem using the headset mic. If you do, you may have to do some EQ adjustments on the mic settings of the keyboard, particularly with the high and mid level EQs.

Gary cool
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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.)