Hi
For those interested in Football (soccer), VLC media player allows you to reduce the "vuvuzelas effect" while watching your preferred team, by using the following command line :
vlc --audio-filter=param_eq --param-eq-f1=233 --param-eq-f2=466 --param-eq-f3=932 --param-eq-gain1=-20 --param-eq-gain2=-20 --param-eq-gain3=-20 --param-eq-lowf=100 --param-eq-lowgain=15 --param-eq-q1=15 --param-eq-q2=15 --param-eq-q3=15 "yourStream"
"yourStream" being the stream you're watching.
Source : http://blog.nicolargo.com/2010/06/petit ... uzela.html
Unfortunately, VLC doesn't handle (yet) notch filters that would be even more effective !
Have fun !