Apple Logic Pro 8 - Manual (Page 605)

Chapter 27 Bouncing Your Project 605
As you adjust the Start and End position parameters, you are shown the hard disk
space requirements for the bounced file above the Cancel and Bounce (Bounce & Burn)
buttons.
(Bounce) Mode
 Realtime: Creates the bounce file in real time. Use it whenever you wish to bounce
audio and instrument tracks, plus external MIDI sound sources that are routed into
the Logic Pro Mixer via aux channels.
 Offline: Accelerates the bounce process—depending on the complexity of your
arrangement, and available CPU processing power. It also allows you to bounce
arrangements that would normally exceed the processing power of your CPU, if
trying to play them in real time.
Note: Offline bouncing is limited to internal sources (audio or instrument tracks).
External MIDI tracks and audio channel inputs are deactivated during offline bounces.
The offline bounce mode is only available to the output channels of devices that use
native audio driver systems (Core Audio). DSP-based audio hardware can not make use
of offline bouncing due to the nature of its stream-oriented technology (these devices
only work in real time, in other words).
Other software applications that are fed into your Logic Pro Mixer via ReWire can be
bounced offline.
Normalize
Turn on this option if you want to normalize your files before the bounce. Normalizing
scans the incoming audio for the highest amplitude peak. The level of this peak is
increased to the maximum possible level (without clipping), and all other incoming
audio is also increased by this amount.