In Analog Surround 5.1 output with the previous version of pulse that allows 
the subwoofer to work :
- LFE is affecting only the subwoofer volume
- Center has no effect
- Front affects both left and right speakers, but not the subwoofer except if 
you balance left or right
--> This seems to me a normal behaviour


In Analog stereo mode,
- LFE is affecting only the subwoofer volume
- Center has no effect
- Front affects both left and right speakers, but : if you balance left, there 
is no more subwoofer output, and if you balance right there is full output on 
subwoofer
- The subwoofer seems to work "as if" connected to a right output, without any 
lowpass filter
--> This is a completely wrong behaviour

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https://bugs.launchpad.net/bugs/1040873

Title:
  [N56VZ, Realtek ALC663, Black Headphone Out, Right] No sound at all:
  Subwoofer not working

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