Hi. As you've probably noticed you can choose 4.1 in the GUI for configuration of the sound. However for me it didn't work. When I choose 4.1 the subwoofer channel won't get any audio. To solve this I must remap!
Open /etc/pulse/default.pa (sudo gedit /etc/pulse/default.pa)
Add the following lines at the bottom
load-module module-alsa-sink device=hw:1,0 sink_name=working channels=5 channel_map=front-left,front-right,rear-left,rear-right,lfe
load-module module-remap-sink sink_name=realWorking master=working channels=5 master_channel_map=front-left,front-right,rear-left,rear-right,center channel_map=front-left,front-right,rear-left,rear-right,lfe
These lines remaps the LFE-channel to the center channel (which is 50% left, 50% right if you don't have one). My 4.1 system doesn't have a LFE input (so it isn't a real 4.1 in my opinion, but it's called so by the manufacturer). The system (amplifier in speaker) takes LF-signals from the front and redirects to the subwoofer.
NOTE that "device=hw:1,0" in the remap is specific for my setup. You might get some help from running "aplay -l" or just experiment. First case to test is "device=hw:0,0"
When you're done restart pulseaudio simply by writing "pulseaudio -k" (not sudo). When you kill pulseaudio it starts by itself.
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