[ubuntu] Get sound in center speaker when using Pulseaudio.

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http://ubuntuforums.org – I set up my fathers computer (Ubuntu 11.10) and receiver using Setup_audio_over_HDMI_on_nVidia_GeForce/nForce_controller and the mapping using Pulseaudio worked great when using speaker-test but when we play stereo audio there is sound in front l, front r AND front center but no lfe. It works fine when using ALSA where we get front left, front right and lfe. Can't Pulseaudio understand or be configured to send stereo/two channel audio to only front l, front r and lfe? Regards. (Hardware)