Apple Logic Pro 9 - Manual (Page 841)

Select the “Use default values” checkbox to display default settings for certain Content
column entries. For example, the Project Title and Tempo (Beats Per Minute) are
automatically filled in.
Selecting the “Use default values” checkbox also sets the Initial Key pop-up menu to
the first entry shown in the global Signature track. This is “default: C” if no key has been
set for the project. You can choose another key from the menu.
• “Add to iTunes library” checkbox: Adds the encoded MP3 file to the iTunes library.
Setting M4A: AAC Format Options in the Bounce Window
Click the M4A: AAC name and select its checkbox in the Destination pane to access the
following options:
• Encoding pop-up menu: Choose Advanced Audio Codec (AAC) or Apple Lossless to
determine how your .m4a (commonly referred to as MP4) file will be encoded. Both
encoding algorithms provide high-quality audio; the AAC format uses a higher
compression ratio, resulting in smaller file sizes.
• Bit Rate pop-up menu: You can choose a rate between 16 kbps and 320 kbps.
Note: This parameter is only available when the AAC codec is chosen.
• “Encode with variable bit rate (VBR)” checkbox: Variable Bit Rate encoding compresses
simpler passages more heavily than passages that are (more) harmonically rich, generally
resulting in better-quality files.
Unfortunately, not all media players can accurately decode VBR-encoded files, which
is why this option is turned off by default. If you know that your target listeners can
decode VBR-encoded files, you can turn this option on.
Note: This parameter is only available when the AAC codec is chosen.
841 Chapter 29 Bouncing Your Project