Roland UM-3EX Owner's Manual page 34

fig.oms-9e.eps_35
9. From the Edit menu, select OMS MIDI Setup.
In the OMS MIDI Setup dialog box that appears, check
Run MIDI in background, and click [OK].
fig.oms-10e.eps_35
10. From the File menu, choose Make Current.
If you are unable to select Make Current, it has already
been applied, and you may continue to the next step.
11. Verify that MIDI transmission and reception can be performed correctly.
From the Studio menu, choose Test Studio.
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A diamond mark ( ) indicates the settings are enabled.