[sound] Subwoofer slider changes center volume not LFE

[Daniel Steszewski]

OS: Ubuntu 14.04.4 LTS
pulseaudio-version: 1:4.0-0ubuntu11.1
unity-control-center-version: 14.04.3+14.04.20150916-0ubuntu1

I have with my system the common problem of exchanged center- and LFE-channels,
so I had to change the channel-mapping in /usr/share/pulseaudio/alsa-mixer/profile-sets/extra-hdmi.conf (exchanging front-center and lfe for 5.1 and 7.1).

Now the channels are mapped correct (tested using speakertest),
but the subwoofer-slider still controls the level of the front-center-speaker.
(It did also with default channel mapping.)

It seems the subwoofer-slider doesn't respect the channel-mapping.

Additional information (workaround):
This one I also could fix for the GUI of the sound settings by exchanging [Element LFE] and [Element CENTER] in /usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf,
but now it is exchanged in the alsa-mixer (but this one I don't really use).