Hello jan and welcome to the Shack!
What cable connections are you using and have you designated the audio for each source within the setup menu? For example, if your DVD player is using HDMI 1, you have to tell the receiver that it is using that input.
What cable connections are you using and have you designated the audio for each source within the setup menu? For example, if your DVD player is using HDMI 1, you have to tell the receiver that it is using that input.