This is an excellent free VST gate that supports sidechaining. The SSS Gate provides easy ducking and keying effects. Ducking and keying are some of the hottest effects in electronic music production today. Stay tuned for a ducking and keying tutorial from SonicTransfer.com. In the meantime, click the link below to download the SSS Side Chain Gate/Expander.

SSS Side Chain Gate/Expander - Free Windows VST