Now it's time for me to feel embarrassed   
Thank you! I really didn't hope that this was
that easy.

Hello, I own a dex-p1r unit with black ip-bus.
It seems, that there is no AUX mode, only
multi-cd and in that mode the line inputs are
muted unless there is no activation word from
ip-bus.
I have no need for controlling anything via ip-bus
so is there a simpler way to get AUX inputs from
multi-cd mode, for instance just send a signal
to the head unit, that the track is playing?
I'm sorry if this question have been answered before
but i could not find it.