Casio BE-300 Listening to music on CASSIOPEIA - Manual (Page 9)

[ Listening to music on CASSIOPEIA ]
(6) Use an application like File Explorer to put MP3 music data files into the PC folder
that was created by Step 5. (Initial setting --> C:¥CASSIOPEIA¥Music) Then click
the [Synch] button again.
(7) Synchronization will start, and the window shown below will appear.
(8) When synchronization is complete, the PC Connect window will appear as shown
below, and the music files will have been transferred.
(9) The files have been prepared for playing on Music Player.
Remove CASSIOPEIA from the cradle and connect the plug for a set of standard
stereo earphones ( 3.5mm jack) into the earphone jack at the bottom right side of
CASSIOPEIA.