Like I said, headset mics are not for everyone. There are singers out there that probably could work without a mic at all--I used to work with one.

Fortunately, I'm able to control my vocals without changing mic position. Some folks cannot. It takes a bit practice and you have to learn a different approach to the songs. But, once the techniques are mastered it's a piece of cake to belt out those notes when necessary, and tone them down to soften the mood.
Good Luck,
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.)