The MCL2AV box  Login to view image However if the local sources are not datalink equipped Beocord or Beogram/CD the MCL2AV will revert the PHONO, CD and TAPE commands to the MCL connection and try to play these source from the main room instead. The local ports can still be operated, but with a longer command like SHIFT, RADIO, 6 for tape and SHIFT, RADIO, 7 for CD. In practice what happens when TAPE is pressed is that the local TAPE  connection is activated for 5-10 seconds, and then it reverts to the MCL connection. My best guess is that it needs some kind of handshake with a datalink equipped unit to keep the TAPE command to the local connection. What I would like to know is if it was possible by simple means to fake a datalink connection on the local connections so the simple TAPE and CD commands can be used. So my question to the datalink bits and bytes experts of this forum is if the handshake between a Master unit and a datalink  Beocord/Beogram require a microchip with some software, or if it could be solved by a more simple electronic circiut? Hope this makes sense and that someone can answer it Thanks in advance