I have installed Roon Server in my QNAP HS-453DX with USB connected to DAC Ayre Codex, Roon tested device. I have also installed Roon at my ipad and desktop. The issue is when I checked from ipad or desktop, I can not find Ayre Codex in audio zone shown. Therefore I can not output music to Ayre Codex. But when I log into the roon server, it shows it connected to Ayre USB device. So my question is what did I do wrong, and how can I make it work. Please help with this. Thanks.