Safest thing would be to connect a 10K resistor to 12v on each MB light output pin.
The pins (5,6 & 7) would then become voltage inputs to the D-180 -
12v = off
0v = on
Audio appears to be available on Pin 4 of the MB, but that would have to be an aux. input to your existing audio system.
UPDATE
You may have this unit with the built-in lights.
If this is the case - check the RST part numbers on the box label - then the 10K resistors are not needed and the pin numbers give above change to 6, 7 & 8.
http://www.rst-engr.com/rst/support/RST-522_523.pdf