Yamaha USB-MIDI INTERFACE UX16 Owner's Manual page 26

The UX16 does not operate correctly, or no sound is heard.
Did you install the driver?
Are the USB cable, MIDI cables, and audio cables connected correctly?
(page 8)
Is the volume setting of the tone generator, playback device, and applica-
tion program set to the appropriate level?
Is the HOST SELECT switch on the tone generator set to "MIDI"?
Have you selected an appropriate port in the sequence software?
Playback response is delayed.
Does your computer satisfy the system requirements?
Is any other application or device driver running?
[Macintosh]
Turn off virtual memory.
Disable AppleTalk.
Cannot suspend or resume the computer correctly.
Do not suspend the computer while the MIDI application is running.
If you are using Windows 2000, it may not be possible to suspend/resume,
depending on your USB host controller and other aspects of your system.
(Even if this occurs, the UX16 will operate correctly if you re-connect the
USB cable.)
(page 9)
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(page 24)