It sounds like the audio subscription isn't active. You will always get the one demo channel with any of our weather units. To get Sirius/XM audio it must be part of your subscription and properly activated. Once activated, you should have no problem changing channels. If you have audio as part of your subscription, I would recommend you refresh/re-activate the unit with Sirius. Wait 20 mins after refreshing, then fully power cycle the receiver. Hopefully then the audio will function for you.