Sybil​ is designed to tame excessive vocal sibilance (ess, tsss, ch, and sh sounds), with a flexible compressor and a variable-frequency high pass filter to ensure optimum de-essing for any vocal performance.

The compressor​ section includes threshold​, ratio​, attack​ and release controls, and the high-pass​ frequency control lets you adjust which high frequency content will get compressed, to ensure that the sibilance is reduced while the rest of the voice remains pristine.

With Sybil, everything you need to get control of vocal sibilance is right at your fingertips.

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https://www.antarestech.com/product/sybil/