Remove peaks for specific frequencies

[Trebor]

These de-esser plugins can selectively attenuate the squeak …
https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/1
https://forum.audacityteam.org/t/please-help-with-de-sser/48588/14
[Steve’s is much faster].