Casio USB MIDI DRIVER Manual page 19

Specifying the MIDI Data Output Destination
1.
On the Windows Start menu, point to Settings and then click Control
Panel.
2.
Double-click the Multimedia icon.
3.
Click the MIDI tab, select Single instrument, and then click
CASIO USB OUT 1, LK USB OUT 1 or MK USB OUT 1*.
* The contents of this dialog box depend on your CASIO musical instrument.
See "7. Connecting to a Computer" for more information.
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