When you are wearing ear buds, 2 of them, you primarily hear what is coming out of the PA system, everything else is blocked just as if you were wearing ear plugs.

Good luck,

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.)