Then try going the other way; teach your Comcast remote to run the NAD.
NAD m17 processor remote versus Comcast cable box
Has anyone gotten theNad Remote to work with a Comcast cable box?. Via so-called learning remotes nad provides.
Ever call nad for customer support? If you do it's really blue sound and they don't understand or know about a nad without having to go to the manual. Craziest company not providing customer support