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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.
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 "UM-2 Driver" is selected in the MIDI
input port setting, cancel this selection (un-check it), and
select (check) only the port (UM-2 Port 1–2) to which the MIDI
device you wish to record is connected.
* When you select "UM-2 Driver," both of the items "UM-2 Port1,
2" will be selected. However if "UM-2 Driver" and "UM-2 Port
1–2" are selected, the selected port will be sounded in duplicate.
Case 6: The UM-2 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.
116
When a USB device is
connected to a computer, the
USB device tells the computer
how much electrical current it
uses. If this value exceeds the
current that the computer is
able to provide (maximum 500
mA), the device cannot be
connected. The UM-2 will
request 120 mA of current
when it is connected to a
computer. Most computers or
self-powered USB hubs will
have no problem with this
current capacity. If you are
using a dual-mode USB hub
(self-powered / bus-powered),
be sure to connect its power
supply (AC adapter etc.) and
use it as a self-powered USB
hub.
Before changing the setting of
the computer switch of your
MIDI sound module, be sure
to turn off the power.
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