I did the settings in the correct way (many people checked that already), for both Audio-Sources the Mixer shows a Signal. But if start recording or streaming, there is only the Mic sound. For some reason the desktop-sound doesn't make it from the mixer to the stream odr recording. Even if i deactivate the mic to have only one sound source, it's not working. I asked so may people in several forums, no one has an idea... The same thing in Streamlabs OBS by the way. So it seems not to be a OBS-only Problem. Does anybody has an Idea what could be the Problem? Soundcard? Headset?