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"I just wanted to let you know that I was very satisfied with the CD you made for me from a really old album my husband had. It is very clear and without background noise - he almost misses all that hissing. He was so excited to have it and couldn't believe I had found a place to transfer the music by looking on the internet. Thanks again,"

Pressure operation

Method of responding to sound signals in which the sound wave has access to only one side of a microphone diaphragm.