|Expanders are dynamics processing devices, similar to compressor/limiters, which reduce the gain of an incoming signal by some user specified compression ratio.|
|The processing is caused when the level of the signal falls
below a user specified threshold.
The result is an increase in the overall dynamic range of the signal.
|In the case of very large expansion ratios approaching infinity the compressor acts as a noise gate, clamping the input signal level to minimum gain when ever it falls below the threshold.|