I have 5.1 speakers.
I have noticed that if I select 5.1 configuration and try to test the sound, when the test reaches to rear left and rear right I don't hear anything. I found that if I choose 7.1 configuration when the test reaches to side left and side right I hear sound from rear left and rear right.
Can I use the ttable syntax to tell ALSA to create a 5.1 to 7.1 configuration where front(left/right), center and lfe will be unchanged and rear(left,right) will be mapped to side(left,right)? Will this be selectable from UI in KDE or GNOME sound configuration applets?