I have a one issue with my audio.
I would like to connect my TV to my sound card with optical cable and next put the sound to the 5.1 speakers.
I see in pulsaudio control that audio card recieve signal over optical. The problem is that the sound is not send to analog out.
My audio card is Aureon 5.1 mk2 usb.
It probably offers far more than you need but one of it’s features is a patch panel to allow various sound aspects to be connected to one and another.
There may be a much simpler solution though. One for instance - have you checked the mixer level controls? On KDE the mixer is reached by a button on the volume control. The one that may need changing is capture device and maybe capture streams. I understood that unless these are muted by clicking on the speaker icon by each slider that mic input normally came out of the speakers which is what you want… In your case you have 5.1 optical input so I would assume this will be shown as a stream or input.
Have a look at my PulseAudio article. I might say if your receiver has an Optical input, I would go directly to the receiver. Most music content is in stereo and only something like using VLC used to play a DVD movie where you have selected SPDIF output is going to actively be in 5.1 Dolby Digital and you are opting to bypass decode mode in the sound card and PulseAudio must show an option is there for your sound device such as AC3 to check.
Read the entire blog if you please before making a repost here: