Roland UM-4 Owner's Manual page 46

Troubleshooting
Case 3: No sound
Are the USB cable, MIDI cables and audio cables connected correctly?
Refer to" 2. Connections with the MIDI Equipment" (P.12), and connect the cables correctly.
Are the volume controls of your sound module, audio system, and application raised?
Check each of the volume controls.
Are the sound module settings correct?
Set the Computer switch of your sound module to the "MIDI" position.
Before changing the setting of the computer switch of your MIDI sound module
(SC-88Pro etc.), be sure to turn off the power.
Do you use only OMS?
When using OMS on your Macintosh, it cannot operate correctly. When FreeMIDI is installed,
delete the files related to FreeMIDI from the "Extensions" folder.
Case 4: Notes are sounded twice (Notes are recorded double)
Refer to the owner's manual for the sequencer program that you are using. If the "UM-4
Driver" is selected in the MIDI input port setting, cancel this selection (un-check it), and
select (check) only the port (UM-4 Port 1–4) to which the MIDI device you wish to record is
connected.
* When you select "UM-4 Driver," all of the four items "UM-4 Port1, 2, 3, 4" will be selected.
However if "UM-4 Driver" and "UM-4 Port 1–4" are selected, the selected port will be
sounded in duplicate.
Case 5: The UM-4 does not recover correctly from sleep mode.
After your Macintosh has been in sleep mode, exit the software and re-start it.
* We recommend that you make Energy saving settings in the Control panel so that your
computer does not enter sleep mode.
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