For more information, see the following topics:Busses appear on the Bus page of the IO Setup. Pro Tools provides two types of busses:Output bus and internal mix bus settings are saved with and recalled from the session. The advantage of this is that when you take a session from one system to another, track and send assignments are maintained within the session. Where possible, Pro Tools can automatically remap the session’s output busses to the output paths of the system the session is being opened on.
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See Session Interchange for more information exchanging sessions between systems, and on opening sessions in lower version of Pro Tools. Output busses do not exist in Pro Tools 8.0.x and lower.