I am in process of recording a very talented female vocalist who has a bit of lisp. I know there must be a way to deal with it, but I am clueless. I am assuming that it must be similar to dealing with sibilance, and maybe the use of a De-Esser...but I am also clueless as to how to use a De-Esser (I know it is basically a notch filter). I have the Waves Renaissance De-Esser and I'm pretty sure I have their regular De-Esser. I have tried using it with the standard "female vocal" preset, but it doesn't do anything that I can notice. She does have a pretty low and deep voice. If I understood more about how these things work, I might be able to tweak it a bit...but it is all Greek to me, so I am at a loss as to where to even start with the tweaking. Any help would be appreciated. Cheers!