About Waves Primary Source Expander The Waves Primary Source Expander (PSE) is a precision expander plugin designed to reduce stage bleed and sensitivity to feedback when microphones are idle, making it ideal for live sound and mixing live recordings. Reduces stage bleed and sensitivity to feedback when mics are idle Smoothly attenuates levels when the source drops below the defined threshold User-friendly GUI for quick operation – set and forget Internal and external sidechain with high-pass/low-pass filters Ducking mode for added precision in complex live scenarios Release time presets Whether mixing front-of-house or monitors in a live venue, or working on a live recording in the studio, PSE ensures that mics are as loud and clean as possible while preserving the source’s original tone and the natural ambience of the location. System Requirements for Waves Primary Source Expander Windows requirements Windows 10+ VST / AAX macOS requirements macOS Monterey 12, Ventura 13, Sonoma 14, Sequoia 15 VST / AU / AAX