I would like to put the Auto mode but on my Beolab 4 I have only 2 switch : one is for position 1-2-3 and the other one is for PC-Line. I have connect it to my Macbook and I want the power to stop when there is no signal (red light). Don't know how to do it. The manual Beolab 4 has another configuration, it seems. Don't understand that either. Was there 2 versions of Beolab 4. If. yes where is the other manual ?? Can anybody help me? Thanks, Jean-Pierre