Edirol UM-1X Manual Del Usuario página 36

Troubleshooting
What is USB hub?
A "USB hub" is a device that expands the number of
USB connectors. Broadly speaking, there are two types
of USB hubs.
Self-powered hubs (USB hubs containing a power
supply): The USB hub itself has an AC adapter, which
supplies power (normally 500 mA) to the added USB
connectors.
Bus-powered hubs (USB hubs not containing a
power supply): The hub does not contain a power
supply. The power supply of the connected computer is
re-distributed to the added USB connectors.
Case 4: No sound
◆ Are the USB cable, MIDI cables and audio cables
connected correctly?
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.
◆ If you are using OMS, is "Run MIDI in background"
checked? (p. 28)
Case 5: Notes are sounded twice (Notes are
recorded double)
Refer to the owner's manual for the sequencer program that
you are using. If the "EDIROL UM-1 Driver" is selected in the
MIDI input port setting, cancel this selection (un-check it),
and select (check) only the port (UM-1 Port 1–2) to which the
MIDI device you wish to record is connected.
* When you select "EDIROL UM-1 Driver," both of the items "UM-1
Port1, 2" will be selected. However if "EDIROL UM-1 Driver" and
"UM-1 Port 1–2" are selected, the selected port will be sounded in
duplicate.
Case 6: The UM-1X 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.
36
The UM-1X cannot be used
with a hub that contains no
power supply.
Before changing the setting of
the computer switch of your
MIDI sound module, be sure
to turn off the power.