KORG D4 - Manual (Page 20)

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3. Switching the power off
Make sure that operations such as song playback or
recording are completed, and turn off the power by
reversing the “Turning the power on” procedure from the
previous page.
Before you power-off, you must press the [STOP] key to save
the song to the card.
Turn the volume of all connected devices to the minimum
setting, and turn off each power switch in order, beginning
with the last device that receives the audio signal.
Never turn off the power when the card access icon is dis-
played. Doing so will destroy not only the selected song, but
may also destroy the songs on the card as well as the Com-
pactFlash itself.