Edirol UA-1D Owner's Manual page 34

Troubleshooting
Noise is present in the playback or recording
Depending on the virtual memory setting or network-related settings, noise
may occur.Please make the following settings before use.
• In "Chooser" of the Apple menu, set AppleTalk to "Inactive."
(This setting is not changed as a result of turning off AppleTalk, as requested
by OMS when sequencer software is started up. You must change the setting
yourself using the "Chooser.")
• In the "Memory" Control Panel, set Virtual Memory to "Off."
• Depending on the way in which you connect to the Internet, use
the UA-1D with the following settings.
•If you connect to the Internet via a LAN cable
•If you connect to the Internet via the internal modem port, or are not
connected to the Internet
After you have made the settings, restart your Macintosh.
* Do not use software that accesses the network (such as a Web browser) at the same time that
you are using sequencer software or audio editing software
Noise is present in the recorded sound
• It has been found that noise tends to be introduced in sound
recorded on the iMac series models, which were released after
the summer of 2000.
• In the SimpleSound application that is included with MacOS, noise
will be heard in the sound if it is played back immediately after
being digitally recorded. Save the sound first, then try playing it
back.
• Update the USB Audio driver to 1.0.5f4.
If the USB Audio driver, which is provided with the Mac OS, is under 1.0.4,
update it to 1.0.5f4.
You can download the driver from the URL below:
Checking the USB audio driver's version
1.
Connect the UA-1D to the computer.
2.
From the Apple menu, select [Apple System Profiler].
3.
Click the [Devices and Volumes] tab.
4.
In the USB section, the screen will indicate "Audio (EDIROL UA-1D)."
Click the arrow at the left of this text.
5.
The number displayed to the right of "Driver version" is the version of
the USB audio driver.
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Use while the LAN cable is connected.
In the "TCP/IP" Control Panel, set "Connect via" to "PPP."
http://asu.info.apple.com/swupdates.nsf/artnum/n11703