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Pro Tools 9 now has Automatic Delay Compensation. It's not a Pro Tools HD feature only anymore. Automatic Delay Compensation, or ADC, helps to manage any delays created from plug-ins and hardware inserts, as well as internal mixer routing via sends and buses. For example, if in your Pro Tools session you have tracks with different plug-ins on them, or if the tracks have different mixing signal paths within Pro Tools, an ADC will help keep them time-aligned. Pro Tools adds the exact amount of delay to each track necessary to make each track's delay equal to the same amount, thus keeping all the tracks time-aligned.
We can adjust the delay compensation within the playback engine, shown here. Right now, we've got no Automatic Delay Compensation, but we can choose between three different options. The Short ADC value uses less processing power than the long ADC value and should be fine for any session that only has a few plug-ins that don't induce much delay. The Long ADC value allocates the maximum amount of resources for delay compensation. You should use this in sessions where there are a lot of plug-ins causing a large amount of delay.
Automatic Delay Compensation should always be enabled during playback and mixing, and during many recording situations. Now while you don't need to activate delay compensation when you're recording your first tracks in a session, once your session start to become a little more complicated via signal routing and insertion of plug-ins, using ADC will become a necessity. I'll discuss much more about ADC in the recording and mixing chapters in this course.
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