Have a look at this thread: https://archivedforum2.beoworld.org/forums/p/8855/78144.aspx#78144
The AV signal will be one-way (into the TV), but the second-to-last post suggests that you may be able to control the B&O devices (if AVL means datalink in this context*)
* EDIT: I had a look at the SCART to mini-AV pinout connections in the Beolink Handbook v1.9 (page 128) and it shows that SCART pin 8 (which is used for datalink) is mapped across to mini-AV pin 6 and is also labeled as AVL. The part number of the official B&O cable (3m version) is 6271217 D.
