Thanks for the replay.
Meanwhile I have from another source been told that this Denon does not seem to follow any standard for playback of files from USB. It will play the files in the order they were added to the USB stick!
This is really an odd standard, and makes it difficult to add a file or change the playorder of files in a set list.
The settings for Shuffle or Random seem to apply to CD tracks.

Best regards
Aulis