Chony,
I don't have my keyboard set up right now, but if I recall, the problem is with the mic settings and I believe if you turn or, or possibly off, the Noise Gate, this will solve the problem.
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.)