I'm not really sure what you mean, but I try:
If you mean that you want to listen to a linked audio source while watching TV it will be working i you use the Link-AV command. Select the Link-AV command on your Beo4 by pressing List repeatedly until it's displyed. Then press the source button you want to listen. The TV should display your video local video source togehter with the linked sound.
To get stereo sound of linked video sources you use just the same procedure. After having linked a video source, you issue a Link-AV command with the same video source. You will get the stereo sound over ML instead of mono linked audio.
hfat