This book, "Pro Tools | First 12 - How it Works" was the first manual available for the free version of Pro Tools. It is the best way to learn Pro Tools, explaining all the functionality, concepts, and workflows with easy-to-understand graphics.
This is book is also perfect for users of the standard Pro Tools version because the
Pro Tools | First app contains about 80% of the standard Pro Tools app with the same functionality and user interface.
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version available on Apple's iBooks Store
available on Amazon