An audio amplifier designed to provide an output level that increases out of proportion to the input level. An expander does the opposite of a compressor; it expands signals above a set threshold. If sounds above a threshold are expanded, it is equivalent to attenuating those below it. It can thereby reduce noise or low-level background sounds and when so used is called a noise gate. By attenuating decaying sound, reverberation time can be reduced.
"I received my recordings in the mail yesterday. To say I am pleased with the end result would be an understatement. The original recording has been in it's original paper sleeve and stuffed into a trunk for years. As it's a 78rpm recording and I have no player for that speed recording, I could not listen to it beforehand. When I received the ..."
