Dead Duck Software Expander v1.5.9 x64 x86 VST WiN [free]

x64 x86 VST WiN, 3MB
Expander
A downward expander with optional external side-chain input.

It includes the following features:
Input gain control (+/- 20 dB)
Expansion threshold down to -40 dB
Expansion ratio from 1:1 to 10:1
Attack and release controls
Sidechain input gain trim
Sidechain 12 dB/oct high-pass filter
Side chain 'listen' option with metering
Option external sidechain input
Level meters for input and output
As the name might suggest the Expander is basically an 'inverted' compressor in that is allows dynamic range to be increased by applying gain reduction to the signal when it falls below a set threshold. These basic differences aside the controls of the Expander are much the same as those of the Compressor: set the 'Threshold' to determine when gain reduction is applied and 'Ratio' to determine by how much.