This is a short bit of a longer video I’ll be making about dealing with sibilance (harsh aggressive “hiss” sounds on certain sounds.) I’m doing the editing on spoken audio here, but works with singing too. (This spoken audio is being used in music.)
This seems tedious, but you can get pretty fast at it, with time. And it works much more naturally than software or hardware.
You can also do this, then add whatever software or hardware you’d use (dynamic compression, DeEsser, etc), but add less of it than usual, to get a much more natural sound. Sibilance can be heard on these letters:
S (usually the worst, and often worse at the start of a word)
Here is my music, BipTunia, and here are some free VSTs I made, and some more audio tips https://biptunia.com