Oh, thats interesting Background to the AddOn, thanks for sharing. There are indeed de-essers in very different qualities out there. Good to know that this one is on the good side!
You’re welcome, but you can actually find it described similar in the “shop”.
Elsewhere, A&H describes it in more detail as follows:
Based on the flagship iLive FX engine, the De-Esser emulates the classic Auto-Threshold circuit commonly found on high end hardware units. This produces a constant sibilance reduction regardless of signal level, resulting in a more natural De-Essing process. In comparison, threshold based De-Essing produces inconsistent reduction activity which can result in unnatural vocals.
De-Esser features an adjustable frequency point (and a Listen button to allow monitoring of the sibilant region - unfortunately not in SQ and QU). The response of the De-Esser and the amount of reduction applied are adjustable to suit vocal programme. Three filter types are available: the Classic industry standard most effective with sibilance in the 3k to 6k range, Shelf for reduction around and above the selected frequency, and Band Pass, most effective when sibilance is in the 5k to 8k range.
But to everyone else, sorry for for actually going off-topic.