Available for download, ERA De-Esser Pro from Accusonus is designed to mitigate the harsh sibilance that often plagues vocals. Use the plug-in while mixing music or working in post-production.
The interface is simple and easy to use. Most of the time, you only need to adjust the Processing knob at the bottom of the GUI, and the algorithm takes care of the rest. Still, Accusonus gave ERA De-Esser Pro a few other parameters to target troublesome audio, including a Focus slider and a Shaping slider.
Sibilance can occur in a wide range of frequencies, so the Focus slider lets you target the most troublesome offenders without negatively affecting everything else. When you click the speaker icon to the left of the Focus slider, you can solo the range currently in focus and audition whether or not you're in the right place by ear.
The Shaping slider changes the curve of processing, giving you a more natural and soft response at one end and a harder, tighter response at another. You'll also note the Difference button under the output meter. This control removes the band being de-essed from the output signal, so you can hear every bit of unaffected audio. This can be a useful monitoring tool for ensuring you're de-essing the right range.
ERA De-Esser Pro is compatible with Mac and Windows operating systems. Use it in AU, VST, and AAX formats.