The Beolab 3500 will probably not support the A.AUX command. according to this thread https://archivedforum.beoworld.org/forums/t/36474.aspx this is first supported from SW ver. 3.33 in the BL3500
My BL3500 is at SW2.0 and supports A.AUX (whereas my BL2000 at SW1.1 doesn’t). I think Keith’s post in that linked thread is a bit confusing – there were a few other anomalies spotted when we were testing BL3500 with BL1611.
