Perhaps if the audio was fed into a Playmaker, auto-sense on its line-in could switch on connected PL speakers and you would have Beo4 volume control also? You’d probably need the PM in A.OPT 4 so that it will respond to the ‘link mode’ volume commands that are used to activate the BL1615, and you’d have to avoid the A.MEM command as this would put the PM into Airplay mode.
If the PM works then maybe Essence would be similar.
