I am trying to duplicate the stereo output to two channels on the rear ports in ALSA.
Pulse will not connect and i don't see the benefit to fighting with that anyway.
I have tried these routes
http://drona.csa.iisc.ernet.in/~uday/alsamch.shtml used this part in .soundrc
# for 5.1 speakers
pcm.ch51dup {
slave.pcm surround51
slave.channels 6
type route
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
ttable.0.4 0.5
ttable.1.4 0.5
ttable.0.5 0.5
ttable.1.5 0.5
}
# for 4.1 speakers
pcm.ch41dup {
type route
slave.pcm surround41
slave.channels 5
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
ttable.0.4 0.5
ttable.1.4 0.5
} put the other part in local.rc, ran that as root
http://www.linuxjournal.com/node/8234/print I read through almost all of what is a tedious and long page, but got no real understanding of how to do what I wanted.
http://alsa.opensrc.org/SurroundSound#Custom_Routing_of_Signals_to_Surround_Outputs I tried several of those and either got an error message in console saying
ALSA lib pcm.c:2212:(snd_pcm_open_noupdate) Unknown PCM surround51
Playback open error: -2,No such file or directoryand haven't been able to make anything work. I am obviously missing something, or missing a step. I am pasting the append they recommend into .asoundrc in my home directory, rebooting and not getting any luck.
I don't want or need 5.1 though, just quad.
If any one can tell me what I am doing wrong, it would be appreciated.
