“Roth-AIR is a mixing tool for easily adding airy, crispy presence to your audio.
This is achieved by a combination of multiband compression and gentle saturation of the highs. It enables for a stronger, more consistent presence of high frequency material and works particularly well with vocals, synths and strings.
The process is made easy by a simple user interface, automatic makeup gain and a combined function “AIR” knob.
Roth-AIR is available for free in 32-bit and 64-bit as VST and AU (OS X only) plugins for Windows and Mac.”
Source : kvraudio.com