I tried everything listed in the installation guide, without success. A screenshot of the PulseAudio Configuation tab shown the problem. In the profile dropdown menu for the audio expansion card with the 3,5-mm-plug connected only the options “Analog Stereo-Ausgabe” (Analog Stereo Output), “Digital Stereo (IEC958)-Ausgabe” (Digital Stereo (IEC958) Output), and “Aus” (Off) show up. No Option for “Analog Stereo Input” is shown, although according to the marketplace entry Audio-In should be supported. Definitely no idea.
