Is it possible to connect a BeoLab3 temporarily with a MacBookPro (to listen musik) and/or with a BeoVison MX 4000, without disconnecting cables ?

Connect the MacBook Pro into the Audio-Aux link input on the MX4000 with a minijack > 5-pin DIN cable, which you can get at most B&O dealers, and Lifestyle-AV. Make sure the MX4000 is in Picture Option 2 (or if you have a Beo4, it's called 'V.Opt' and then the number 2). On a BeoLink 1000, pressing any of the audio sources, such as CD will activate the Audio-Aux input, and the same goes for Beo4.

If your MX is a 4002 and not a 4000, you'll need to look at doing things another way...

Thanks i checked it, my MX is a 4200, does it work in the same way ?

No, it won't. You'll need a minijack - 2x phono cable, which can be bought in most B&O dealerships (it's the same cable used for connecting an iPod to a BeoSound 4).

This will then go into the 'Camcord' input on your MX4200, which is activated with the 'Camcord' function in the 'List' menu on your Beo4.

Hmm, my MX 4200 has a Masterlink jack. How should that work ?

Ignore that - just use the Camcord input, which looks like 3 little circular connections, yellow, white and red. Connect the cable you'll get from your B&O dealer (or wherever else) into the white and red connections and activate 'Camcord' on your remote.