Apple Logic Pro 7 - Manual (Page 299)

Chapter 6 Logic’s Mixing Facilities 299
When an Audio Instrument track is selected, it is ready to be played in real-time and
consequently produces some system load. Normally, Logic releases system resources
used by the Audio Engine when the sequencer is stopped. This is not true, however, if
an Audio Instrument track is selected in the Arrange and is therefore available for real-
time playing. Selecting a MIDI track or a normal audio track exits this “stand by” mode
and releases reserved system resources the next time the sequencer is stopped.
Note: Muting an Audio Instrument track in the Arrange does not reduce system load.
The Audio Instrument Object features the following elements (see “Elements of the
Audio Object” on page 270): Inserts, Bus Sends, Input, Output, Grouping, Automation,
Pan, Level, and Level meter, Mute/Solo.
Accessing Multiple Outputs
Logic supports the EXS24, UltraBeat, and AU-compatible instruments that are capable
of addressing multiple outputs. In addition to the “Mono” and “Stereo” submenus of the
Audio Instrument menu, a “Multi Channel” submenu lists all Instruments that offer
multiple outputs. A plug-in needs to be inserted from the “Multi Channel” submenu, in
order to access its individual outputs.
Please note that not all plug-ins (Logic and third-party) are multi-output capable. If the
Instrument does not appear in the Multi Channel submenu, it is not equipped with
multiple output facilities. Please make sure that the instrument you wish to use is
properly installed and authorized.
The first two outputs of a multiple output instrument are always played back as a
stereo pair by the Instrument channel that the plug-in is inserted into. Additional
outputs (3 and 4, 5 and 6, and so on) are accessed via Auxiliary Objects (see “Auxiliary
Object” on page 303).
Software Instrument Pitch
The Song Settings > Tuning > Software Instrument Pitch parameter remotely controls the
main tuning parameter for all software instruments by ±50 Cents. Some instruments
created by other manufacturers may not recognize this remote command.