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I have looked around and I came across (b2sb) and well its not clear how to install it. It also mentions there that it is used in MPlayer but I can't see how.

So how do I go about installing it?

As a further extension, I'd like to have virtual 5.1 on my headphones. I know Dolby Headphone does this and there's a Foobar2000 plugin in Windows but that applies to audio only. There is the HRTF implementation of MPlayer but there's lots of crackles and pops when its enabled.

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This is a plugin for ALSA.

Go to Sourceforge download page and download the LADSPA plug-in package.

cd folder_where_you_downloaded_the_package
tar xf ladspa-bs2b-VERSION.tar.X # the VERSION and X depend on the downloaded version and package type
cd ladspa-bs2b-VERSION
./configure --prefix=/usr # Prefix may be different depending on your distribution but usually /usr is fine
su -c "make install"

Plus there is a FOOBAR 2000 plugin also

Source: Stereo to binaural with ALSA using bs2b LADSPA plug-in

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Thanks for that. I saw that article before posting. So, how I understand it creates a new "device" in the output devices area so we can choose that and then all audio gets routed through the bs2b LADSPA plug-in? Is there no GUI way as such to define a configuration that does the same? – Eshwar Mar 6 '12 at 9:04
there is Gnome ALSA mixer in the software center – Ringtail Mar 6 '12 at 9:13
I don't see any options to add "devices" in Gnome ALSA Mixer. Think I will try the Jack approach.. – Eshwar Mar 7 '12 at 6:59

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