Something that lets me select a frequency above which all sounds would be filtered in real time? I don’t know if a software can separate the high pitched sounds from the rest of the sounds. If it was possible that would be perfect. If not just removing all sounds when any sound goes above the threshold.
I’m sure ffmpeg (command line software) can, tho idk exactly how
https://ffmpeg.org/ffmpeg-filters.html#lowpass
Or use sox.