this post was submitted on 19 May 2024
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I haven't used it, but it looks like there's a program called pulseeffects that can do some real-time processing for PulseAudio, including that:
https://www.maketecheasier.com/improve-linux-pc-audio-with-pulseeffects/
EDIT: For more-generally applying effects, there's also a Linux "audio effect plugin" standard called LADSPA, large library of those, and I know that I've seen ways to apply it to streams in realtime.
googles
https://askubuntu.com/questions/43950/how-can-i-apply-a-ladspa-plugin-to-a-pulseaudio-stream
If you wanted to do something like reverb or pitch-shift all the audio being played back, I expect that that'd let you do that.