Sheen Machine.

Sheen Machine uses Eventide's patented Structural Split technology to separate the transients in a signal, such as attacks and sibilance, from its sustained tonal content. It then adds high end to the tone without boosting the transients, avoiding the harshness a high-shelf boost tends to bring. The amount is set with a single dial, which makes it a quick way to give a dull recording, a vocal or a synth part more air.