DAMP

to diminish the intensity or check the vibration of a sound

deaden (especially by wrapping)

restrain or discourage lessen in force or effect

SYN - soften, muffle, dull

"He was hoping to dampen the sound by placing a blanket over the speakers."

"At the very least you must do somethign to dampen the effects of her religious upbringing."

"He didnt want to get rid of the taste completely just try damp it."