Sessions & Tracks : DigiBase : Preview Modes : Preview in Context

Preview in Context
Pro Tools lets you preview audio files in DigiBase browsers while playing back a Pro Tools session. Tick-based audio files (those with tempo detected Elastic Audio analysis, as well as REX and ACID files) can play back in tempo, and at the corresponding bar and beat location, with session playback. Tick-based audio files audition at the session tempo when the Audio Files Conform to Session Tempo option is enabled.
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Deselect the Spacebar Toggles File Preview option in the Browser menu to start and stop session playback with the Spacebar without previewing in the DigiBase browser. Use Command+P (Mac) or Control+P (Windows) to start and stop preview in the front-most DigiBase browser during session playback.
Reserve Voices for Preview in Context
(Pro Tools HD Only)
Preview in context (previewing audio files in DigiBase during session playback) uses disk voices for playback. The number of voices required depends on the channel width of the selected Audition Paths on the Output page of the I/O Setup window. For example, if a stereo audition path selected in the I/O Setup requires 2 voices for preview in context, whereas a 5.1 audition path requires 6 voices. If one or more voices are not available for preview in context because they are in use by disk tracks (or routing for RTAS processing), the Preview button in DigiBase browsers will be unavailable during session playback.
Pro Tools provides an option to reserve voices for preview in context. The number of reserved voices is determined by the channel width of the selected Audition Paths in the I/O Setup. Voices reserved for preview in context are unavailable for disk tracks.
To reserve for voices for preview in context:
1 Choose Setup > Preferences.
2 Select the Operation tab.
3 Enable the Reserve Voices For Preview In Context option.
4 Click OK to close the Preferences dialog.