Apple Logic Pro 9 - Manual (Page 307)

The Record button of selected software instrument tracks gives visual feedback of the
current state of a software instrument:
Selected instrument, not
yet in live mode
Instrument in live mode
Switching Instruments to Software Instrument Live Mode
When you select a software instrument track, it does not immediately switch into Live or
Performance mode. You must send a MIDI event before Live mode is activated, but this
takes around 100 milliseconds to engage, which is more than enough time to destroy
the timing of your first played note.
If you require perfect timing for the first played note, you need to send silent MIDI events
in advance; press the sustain pedal, or make a small move of the pitch bender or
modulation wheel, for example. This will turn on Live mode.
Saving Software Instrument Processing Resources
The Bounce function allows the entire instrument track to be recorded as an audio file.
This bounced audio file can then be used (as an audio region) on a standard audio track,
allowing you to reassign the available processing power for further software instrument
tracks. For more details, see
Bouncing Your Project .
You can also make use of the Freeze function to capture the output of a software
instrument track, again saving processing power. For details, see
Freezing Tracks in the
Arrange Area .
307 Chapter 10 Working with Instruments and Effects