Apple TV/FM Radio System - Manual (Page 57)

Selecting stereo or mono sound
The Apple FM Radio is preset to play sound in stereophonic
(stereo) sound if the station broadcasts in stereo. Some
stations come in more clearly if you select monophonic
(mono) sound. To select stereo or mono sound, follow
these steps.
1 Open the Options menu and drag to the Sound choice.
A pop-up menu appears beside the Sound choice.
2 Select Stereo to receive stereo sound or Mono to receive
mono sound.
The selected sound mode has a checkmark beside it.
50 Chapter 2