M-Audio Ozone whine

Hi folks,
I have an M-Audio Ozone, USB midi and audio interface connected to my iBook. (G4, 1.33gHz, 768MB RAM, OSX 10.4.9))
Whenever I load up Logic Express a faint whine starts to appear from my speakers.
Shutting down logic stops the noise.
It also appears if the Ozone is still connected and I play a song via iTunes or Quicktime.
I've downloaded the latest driver from the M-Audio site and tried using different connection cables and output jacks on the Ozone, all without success.
Has anyone else come across a similar problem?
Thanks,
Robert.

There have been cases of reported whine with some Mac's.
The solution I am aware of has been to download the CHUD tool from Apple's developer site.
It will add 'Processor' to the system pref's. Older versions show a 'Hardware" preference panel instead.
Open it and uncheck 'Allow Nap'.
http://acapella.harmony-central.com/forums/attachment.php?attachmentid=208800&d= 1157836667
Versions here:
ftp://ftp.apple.com/developer/ToolChest/Testing_-_Debugging/Performancetools/
However depending on your computer the newest version may or may not show the Allow Nap checkbox.
If it doesn't, unistall with CHUD remover before installing another.
I would try 3.5.2 with a G4 and look for Hardware preference panel.

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