Fujitsu FM3 family User Manual page 23

(2) Song Selection Operation
Pressing the song selection next switch selects audio file in the following order.
music1.mp3 => music2.mp3 => ... => music5.mp3
If the next switch is pressed while music5.mp3 is selected, music5.mp3 is then
selected.
Pressing the song selection previous switch selects audio file in the following order.
music5.mp3 => music4.mp3 => ... => music1.mp3
If the next switch is pressed while music1.mp3 is selected, music1.mp3 is then
selected.
LED1 to LED5 correspond to music1.mp3 to music5.mp3; the lit LED indicated the
file currently selected.
Songs can be selected while music is not played.
Select your favorite music!
Figure 17 Song Selection by Previous/Next Switch
Selection Previous Switch
Selection Next Switch
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