Hi JKLM,
Congratulations on the new-to-you Sundance and welcome to the Heartland Owners Forum.
It's possible the other 2 switches might turn on ceiling speakers so you can listen to the radio in the bedroom. Of course, the radio has to be on to test this. If the sound system has a CD or DVD player built in, you may also be able to hear the CD or DVD audio through those speakers.