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"Back in the late 40's our father, then a single man worked in a Philadelphia music store. He made a voice over demo record single side on a 78. Dad died in 1962 and the record was tucked away for decades until I found it recently quite by accident. A friend had turntable for 78 speed and i found Dad was quite the tenor, but as expected the ..."

Pressure gradient operation

Method of responding to sound signals in which the sound wave has access to both sides of a microphone diaphragm.