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An expander works in a similar way to a compressor, with a compressor you set the threshold and when the signal goes over this threshold the compressor starts to work. The signal over the threshold is attenuated (reduced) at the rate of the other parameter settings (ie. attack, ratio, release,etc.). An expander works in an opposite fashion, the threshold is set and any part of the signal dropping below this threshold will be affected by the expander and this level will be raised. The expander therefore like the compressor balances out the signal making it sound more professional.

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17y ago

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