Now shipping, the Waves Primary Source Expander (PSE) plug-in for live sound lets users reduce stage bleed and sensitivity to feedback when a mic is idle by automatically lowering mic levels between musical phrases. At the heart of the plug-in is a precision expander, tailored for melodic sources such as vocals, guitars, strings, brass, woodwinds and more. PSE works like a fader that smoothly attenuates the channel’s level when the source goes below the threshold that’s been set. The user determines both the threshold and the amount of attenuation. Reducing stage noise leakage when microphones are idle will help users get an overall mix that is more coherent, more focused and has better phase relations.