Apple Logic Pro 9 - Manual (Page 82)

Tip: If no software instrument track exists, you can also drag the Apple Loop from the
Loop Browser directly into the blank Arrange area. A track and corresponding channel
strip are automatically created, and the Apple Loop is loaded.
8 Click the Piano Roll button at the bottom of the Arrange area.
The Piano Roll Editor is shown, displaying the contents of the region you just created in
the Arrange area.
9 Move the playhead to the beginning of your project by clicking the Go to Beginning
button in the Transport bar.
10 Play your project by clicking the Play button in the Transport bar.
You will hear the audio file and instrument loop you added to the project. You may like
the melody of the software instrument loop, but not its sound. Utilize the Library to assign
another sound to the software instrument track.
82 Chapter 3 Overview of the Logic Pro Interface