Hello,
got here 2 sinks / soundcards:
sink0 Name: alsa_output.pci-0000_01_05.1.hdmi-stereo
                       alsa_card.pci-0000_01_05.1
sink1 Name: alsa_output.pci-0000_00_14.2.analog-stereo
                       alsa_card.pci-0000_00_14.2

pactl stat:
Momentane Nutzung: 1 Blöcke mit insgesamt 63,9 KB Bytes.
Während gesamter Laufzeit: 8006 Blöcke mit insgesamt 195,5 MB Bytes.
Sample-Pufferspeichergrösse: 0 B
Name des Nutzers: pulse
Rechnername: ltsp20
Name des Servers: pulseaudio
Version des Server: 0.9.21-63-gd3efa-dirty
Standard-Sample-Angabe: s16le 2ch 44100Hz
Standard-Kanal-Zuordnung: front-left,front-right
Standard-Ausgabe: alsa_output.pci-0000_00_14.2.analog-stereo
-Standard-Quelle: alsa_input.pci-0000_00_14.2.analog-stereo
Cookie: 01bd6117

In smplayer got sound over sink0 hdmi-stereo
In ltsp-localapps mythfrontend got sound over sink1 analog-stereo

in pulseaudio FAQ found this:
        Can I use PulseAudio to playback music on two sound cards 
simultaneously? 

        Yes! Use module-combine for that.

        load-module module-alsa-sink device="front:Intel" sink_name=output0
        load-module module-alsa-sink device="front:HDA" sink_name=output1
        load-module module-combine sink_name=combined master=output0 
slaves=output1
        set-sink-default combined

        This will combine the two sinks output0 and output1 into a new sink     
                
        combined. Every sample written to the latter will be forwarded to the   
                
        former two. PulseAudio will make sure to adjust the sample rate of the  
                
        slave device in case it deviates from the master device. You can have 
more              
        than one slave sink attached to the combined sink, and hence combine 
even       
        three and more sound cards.

When I try this:
pactl load-module module-alsa-sink device="alsa_card.pci-0000_01_05.1" 
sink_name=output0
Modulinitialisierung failed

Finally I want audio playback on both cards simultaneously.

Gruß Marco

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