That Audacity de-esser plugin, (By Paul-L), does not have a “linked stereo” option:
it will add a weird spatial [sic] effect if applied to voice which has had stereo reverb added.
You should apply that de-esser to mono vocal before any reverb (or music) has been applied.
There is a simpler faster but less-precise de-esser plugin here, (by Steve).
It always has “linked stereo” which avoids the unintentional spatial effect.
