Pulseaudio: use 5.1 for videos and 2.1 for music

Is there any way to automate the process described in the title?
I only was able to make pulse play stereo files with 2.0 (without sub) and movie files in 5.1 by adding "disable-remixing=yes" in daemon.conf
how can i make sub in stereo work and still be able to have 5.1 for music automatically?

brebs wrote:
Dunno about pulseaudio, but this can be done in ALSA - here's my ~/.asoundrc as an example.
The music player needs to output to the upmixing PCM.
using your config i get this:
➜ ~ speaker-test -D upmix_20to51 -c 2 -t wav
speaker-test 1.0.25
Playback device is upmix_20to51
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
ALSA lib pcm_ladspa.c:1512:(snd_pcm_ladspa_add_plugin) Unable to find or load plugin '(null)' ID 1672, path '/usr/lib/ladspa'
Playback open error: -2,No such file or directory

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Pulseaudio: use 5.1 for videos and 2.1 for music

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