I didn't succeed with what I wanted, but I did learn some things about pulseaudio. And got my audio to work pretty good, even if not exactly as I wanted. Now my system does remix audio from stereo to 4 channels (front-left,front-right,rear-left,rear-right). But the reason why this is enabled is that it also routes the center channel to front speakers.
Here's a summary of stuff that I want to remember next time I work with pulseaudio:
- pavumeter:
- paman:
- /etc/pulse/daemon.conf: ... remix, channels (example)
- /etc/pulse/client.conf: ...autospawn...
- /etc/pulse/default.pa: ... sink, remap
- pulseaudio -k && pulseaudio --start