Graco Pack n Play Series Owner's Manual page 22

VOLUME— With each press of the volume button,
the volume will increase by one preset level. Once
at the highest level, the next press will stop the
music.
NATURE SOUNDS— Each press will change to the
next nature sound. After the 5th sound is selected,
the next press will turn sound off.
TIMER— Press once to set timer to 5 minutes,
Press twice for 10 minutes, Press 3 times for
15 minutes.