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A pitch adjustment knob on a mixing board used to bring out-of-tune singers back into key. Named for the heavy metal car wreck Ozzy Osbourne.
Sound Engineer. Jeez Bill, that sounded like someone strangling a sick cat.

Producer: Yeah, if she only sang as good as she looks.

Sound Engineer: Time for the Ozzy knob.
by Eric Maan July 17, 2009
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