Thanks both for clearing that up, I knew there would be some weird quirk.
Steve tells me he can make a datalink Din Bypass cable so hopefully this will solve the issue and I will have remote operation. Just waiting for him to get back to me and I’ll be placing the order.
Even though not an exact match to my 3500 it looks quite nice. I made a little stand for it yesterday to tuck it under my Hifi stand.