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Logic Pro 9 User Manual - Help Library - Apple

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7 Insert the effects in the Insert slots of the channel strip.<br />

As the track is routed to an instrument channel strip (which is being used for an external<br />

MIDI sound module), it behaves just like a standard software instrument track, which<br />

means that you can record and play back MIDI regions on it—with the following benefits:<br />

• You can take advantage of the sounds and synthesis engine of your MIDI module, with<br />

no overhead on your system processor (apart from the effects used on the channel<br />

strip).<br />

• You can use insert effects, obviously, but can also use Send effects by routing the<br />

instrument channel strip to aux channel strips.<br />

• You can bounce your external MIDI instrument parts—with or without effects—to an<br />

audio file, in real time. This makes the creation of a mix, inclusive of all internal and<br />

external devices and tracks, a one-step process.<br />

Note: You cannot use the Freeze function on such tracks, nor can you perform an offline<br />

bounce.<br />

Playing Software Instruments<br />

Software instrument plug-ins respond to MIDI note messages, whereas effect plug-ins<br />

do not.<br />

The output signal of a software instrument is fed into the input (the Instrument slot) of<br />

the instrument channel strip, where it can be processed via inserted effect plug-ins, or<br />

sent to busses.<br />

<strong>Logic</strong> <strong>Pro</strong> supports up to 255 discrete instrument channel strips. The number of software<br />

instruments that you can run simultaneously depends on the computer-processing<br />

resources available.<br />

After an instrument plug-in is inserted, the instrument channel strip can be driven by a<br />

recorded MIDI region, or direct MIDI input—playing your MIDI keyboard, in other words.<br />

Understanding Live Mode<br />

Live mode instruments need to stay in Live mode while the audio engine is running<br />

(when <strong>Logic</strong> <strong>Pro</strong> is in playback or record mode), because switching a software instrument<br />

track out of Live mode creates a gap (or noise) in the audio stream. Obviously, this is<br />

unacceptable.<br />

Software instruments that are live (ready for playing) require considerably more processing<br />

power than those that are merely playing back existing regions. If selecting a software<br />

instrument track automatically activates Live mode, switching between multiple instrument<br />

tracks would compound the problem, possibly resulting in system overloads.<br />

306 Chapter 10 Working with Instruments and Effects

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