No audio from FM

I just got a Sansa Clip+, and was trying out the FM radio.  It was working fine, then I pressed the control to adjust the volume, and the audio cut out completely.  I can listen to songs that I download to the player, but there is now no sound at all from the FM radio.

It is possible that I hit more than one button at a time while I was trying to adjust the volume, since the Clip+ is so tiny.  Could this have muted it somehow?

Thanks, that fixed it!  I didn’t realise that you could mute the FM.