pitchchanger for mpv
Control audio pitch by 0.01. Ctrl+] increases, Ctrl+[ decreases, Reset audio pitch Ctrl+ENTER
Download the file or use this command
curl -s -o pitchchanger.lua https://github.com/gamernoob24/pitchchanger/raw/master/pitchchanger.lua
put them in the ~/.config/mpv/scripts
and add this line to mpv.conf
af=@rb:rubberband