Surround : Multichannel Tracks and Signal Routing : Multichannel Audio Tracks

Multichannel Audio Tracks
For more information, see the following topics:
(Pro Tools HD and Pro Tools with Complete Production Toolkit)
Multichannel audio tracks contain an individual channel for each signal in the track (for example, a 5.1 track would have six channels for left, center, right, left surround, right surround, and LFE).
Multichannel audio tracks can be:
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Recorded directly into Pro Tools, using multiple microphones or microphone arrays, or routed to appropriate multichannel Pro Tools Input paths
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Imported from other Pro Tools sessions
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5.1 format audio files and tracks conform to the Film track layout standard. Regardless of path assignments in the I/O Setup dialog, all 5.1 format audio tracks and meters follow the Film standard track layout:
L C R Ls Rs LFE
Multichannel audio tracks are not required to mix in multichannel formats. Mono, stereo, and all supported track formats can be mixed using Pro Tools track outputs and sends (see Multichannel Signal Routing).