Waves Primary Source Expander - Expander Plug-In (Native/SoundGrid, Download)

The Primary Source Expander from Waves is an expander/ducker plug-in designed to provide a simple and efficient interface for live or live-in-the-studio use. By default, it works as an expander, to reduce background bleed and noise when a source is not playing. Alternatively, it can be used as a ducker, to reduce the level of a source when a different signal is playing.