The only deesser in the plug-in library is the Calf Deesser, which is still Beta. I’ve been using it a lot for the past few weeks, and just can’t get it to act consistently. With the exact same settings it will behave one way one day, and a different way a different day. This is with fairly consistent vocals.
There are instructions online for it, but they don’t explain everything. It has very finicky settings - for example if the threshold is set to anything other than zero, it just doesn’t operate - thats weird.
I tried making my own deesser with an EQ and Compressor with side-chain, but the results were just too heavy handed. I wish there was a multi-band compressor plug-in.
Are there any deessers in the works being converted from other libraries?