Doc,
Since the Avant isn't actually supported by the Halo (yet) but the Core is, can you add the Avant as the primary linked product to the Core and add the NL/ML Converter as the secondary linked product to the Halo and get it to work that way? Both of my integrated BeoVision setups involve a Moment, which isn't supported by the Halo, so I don't know if the Core still shows up as a product on the Halo when used in an integrated setup. You'll still want to follow my 2-steps when making any changes. I went for months scratching my head trying to figure out why my second beogram turntable wasn't appearing as a source on BeoRemote One for bluetooth devices in my NL system.