Well friend,
According to page 24 of the manual here
http://support.casio.com/pdf/008/ap_45_e.pdf
It says
Demo tunes
While holding down the MUSIC LIBRARY button,
press the PLAY/STOP button
....
.and try to play a specific demo tune ........
After playback starts, press the
tone button that
corresponds to the tune you want to play.from the list.
ALSO in the Troubleshooting section page 35
For DEMO tunes UNPLUG HEADPHONES
If it doesn't work, then you need to get a Technician to look at it.
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