Thanks for that Elephant
Last night i did some experiments and i concluded that it can be done but not with the in-built DVD player in bv7.
I use my Panasonic BluRay Player which has in-built wifi and web capabilities. I need a microphone and a sound mixer. Then the analogue sound from the BR goes to the mixer. The sound output (R-L) of the mixer goes into the AV2 scart (or camera) input of the BV7.
Image directly from the BR through HDMI to DVI cable.
And voila. All is running through my setup and i have to say that it is fun. You can either play karaoke DVD's on the BR player, or just browse to youtube and dirctly select the tune you like!
Will see how it goes on Saturday! But karaoke through B&O is a good party maker.