Here's a 'beta' introduction/tutorial to using the X-Custom instruments in Garritan Personal Orchestra. It is an interactive walkthrough on how to load and configure the X-Custom instruments.
Using the X-Custom Instruments: A Flash Tutorial
Any feedback would be appreciated.
Note: You must have Macromedia Flash Player installed to view this tutorial. Also, to follow along at home, you must have the X-Custom library installed on your PC.
Look out for more of these in the future!