Apple Logic Pro 8 - Manual (Page 251)

Chapter 10 Working With Instruments and Effects 251
Setting the ReWire Behavior
In Logic Pro > Preferences > Audio > Devices, you can choose between the following
modes when using ReWired applications:
 Playback Mode (Less CPU Load): Use this mode when streaming channels via ReWire.
This setting requires less CPU power, and should be used when playing back tracks in
ReWired applications.
 Live Mode (Higher CPU Load): Use this mode when you want to play a ReWire
instrument (an instrument running in an external ReWired application) in real time.
This setting requires more CPU resources, but reduces latency, ensuring that the
ReWired instrument is playable.
Working With External Audio Effects
You can use external audio effects units in a similar way to the internal Logic Pro
effects. This is achieved with the I/O plug-in, in conjunction with a multi input/output
audio interface.
To integrate and use an external effects unit in Logic Pro:
1 Connect an output (or output pair) of your audio interface with the input (pair) on your
effects unit.
2 Connect the output (or output pair) of your effects unit with an input (pair) on your
audio interface.
Note: These can be either analog or digital connections if your audio interface and
effects unit are equipped with either, or both.
3 Click an Insert slot of the channel you want to process with the external effects unit,
and choose Utility > I/O.
4 In the I/O plug-in window, choose both the Output and Input (shown as numbers) that
your effects unit is connected to.
5 Adjust the Input or Output volume as required.
When you start playback, the signal of the audio channel will be processed by the
external effects unit.