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I have a TV card with its sound output connected to the CD-in of my mainboard's built-in sound card. There is also a USB sound device connected to my machine. Now I want to play the sound from the TV card via the USB sound output.

I tried the solutions proposed in How do I output my audio input? but they don't work for me. When I run those commands all I get is a lot of low frequency feedback that quickly adds up so that I need to terminate the command after a few seconds.

The reasons for this seems to be that the input source selected in pavucontrol for my internal sound card is my microphone. However, the CD input does not show up in pavucontrol, it only shows up in alsamixer.

Is there something that I am missing here? How can I play my CD-in from my internal sound card via my USB sound device?

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up vote 0 down vote accepted

After some fiddling, I managed to get my CD input recognized by ALSA, see my answer on the other question. Now it shows up in alsamixer.

I ended up using the solution provided in this answer. I created a script in my home directory which contains the following code:

pacat -r --device=alsa_input.pci-0000_00_1b.0.analog-stereo | pacat -p --latency-msec=1

While this is running, sound input from the input device selected in alsamixer (press F4 to switch to input controls) is redirected to my USB audio device. Unfortunately, the input device is reset whenever I lock my screen so I have to change it back to my CD-in repeatedly. If anyone knows how to circumvent this, please let me know.

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