You could have downloaded Apple iBook Audio Updater 1.3 for Mac from our software library for free. The application belongs to System Tools.
From the developer:
The iBook Updater 1.3.6 improves the quality of sound output on Apple's iBook (dual USB) computers introduced in May, 2001
If you are using Mac OS X on your iBook, you must restart in Mac OS 9.1 to install the iBook Audio Update. To restart in Mac OS 9.1, use the Startup Disk pane of System Preferences.
You may want to check out more Mac applications, such as Apple Lion Recovery Update, which might be similar to Apple iBook Audio Updater.
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