Apple Logic Pro 7.1 Manual de usuario descargar pdf (Pagina 15)

Full Plug-in Delay Compensation

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quite matching up with the audio, it’s the nature of Logic’s

AAllll

compensation

mode.

Finally, you need to be aware that Apple designed its

AAllll

plug-in delay com-

pensation mode as a “mixing” mode. Since Logic advances the audio

streams in order to maintain sync, if you attempt to record audio or MIDI

while in

AAllll

compensation mode, you may run into problems, depending if

you have instantiated any delay causing plug-ins. If you are using plug-ins

that cause delay, Logic will advance the audio to compensate for the delay

during playback—so when you record, you will be listening to audio that is a

number of samples advanced from the original song start point. This means

that your recorded performance will be “off the grid” by the number of sam-

ples the audio stream was advanced. If you then subsequently change the

amount of delay compensation that Logic is doing by adding, exchanging,

or removing delay-causing effects, the originally recorded tracks will be

automatically compensated for this change in delay…but the audio or MIDI

you recorded to the previous level of delay compensation will be out of time.

There are two techniques to get around this limitation. The first—and sim-

plest— is to keep plug-in delay compensation set to

AAllll

, and simply never

record any audio or MIDI once you start inserting plug-ins that cause delay.

This has the advantage of being 100 percent foolproof, and allows you to

leave plug-in delay compensation set to

AAllll

. Of course, if you like to record

and mix as you go, this may require an unacceptable change in working

methods.

The second technique is to keep plug-in delay compensation set to

AAuuddiioo

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until final mixdown. This compensation method

does not advance tracks to keep the audio streams in sync, but instead

applies a negative sample delay to those regions that have delay. This

means that in

AAuuddiioo TTrraacckkss aanndd AAuuddiioo IInnssttrruummeenntt

mode, you can still record

and everything will be in sync. A limitation of this technique is that you can

only insert delay-causing plug-ins on Audio Tracks and Audio Instrument

tracks until final mixdown, but this is better than no channels being delay

compensated at all. Logic tries to make this technique as easy to use as pos-

sible by including key commands to switch between plug-in delay compensa-

tion modes, so you don’t need to break your workflow by mousing around in

the Audio Preferences window. And at least we finally have a full delay

compensation mode for mixdown!

23 LogicPro7Power_adon 5/30/05 4:57 PM Page 15

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