Simple mixer control 'Center/LFE',0
  Capabilities: pvolume pswitch pswitch-joined penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 256
  Mono:
  Front Left: Playback 256 [100%] [0.00dB] [off]
  Front Right: Playback 256 [100%] [0.00dB] [off]


you may need to modify the driver to create separate controls for center
and lfe


or try 


[Element Center/LFE]
switch = mute
volume = merge
override-map.1 = center,lfe


http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-output.conf

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https://bugs.launchpad.net/bugs/677067

Title:
  No subwoofer and frontcenter with 5.1 soundblaster x-fi

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