One obvious application for both music and post is vocal cleanup; whether spoken or sung, vocal tracks often present a number of familiar problems that may need to be addressed, and RX has several modules that do just that.
The De-plosive module automatically detects and eliminates plosives. It’s the annoying bassy thumps that can occur on certain letters like P and B. De-ess addresses the equally familiar problem of harsh sibilants, “S”-sounds. But offers an extra twist over conventional dynamics processors. Besides the usual filtered-sidechain method, De-ess includes an option that utilizes spectral shaping, for especially difficult or problematic situations.
Read more about this here: https://ask.audio/articles/musical-applications-for-izotope-rx