Fixed logic error in the process method example.

Fixed broken link.

Clarified discussions of audio unit parameters and automation in Supporting Parameter Automation, Control Code: Parameters, Factory Presets, and Properties, and Parameter and Property Events.

Clarified information regarding audio unit input and output channel counts in Table 2-1.

Added Provide Strings for the Waveform Pop-up Menu section in Tutorial: Building a Simple Effect Unit with a Generic View chapter.

Corrected Define the Factory Presets section in Tutorial: Building a Simple Effect Unit with a Generic View chapter.

Improved naming scheme for parameter and preset constants in Tutorial: Building a Simple Effect Unit with a Generic View chapter.

Added link to the TremoloUnit sample code project in Introduction.

First version