DigiDesign Pro Tools 8.0 Reference Manual page 687

Switching Timebases
All Pro Tools tracks can be switched between be-
ing sample-based or tick-based.
Track height affects how various track controls
appear in the Edit window. The Timebase selec-
tor, which is used for switching a track's time-
base, is only visible in Medium or larger track
heights.
To switch the timebase of a track, do one of the
following:
If the track's height is set to Medium or larger,
click the Timebase selector for the track and se-
lect the timebase. The Timebase selector icon
changes to reflect your choice.
.
Timebase selector Timebase selector
(samples) (ticks)
Track Timebase selector on a track with a Medium
height
– or –
If the track's height is set to Small (or smaller),
click the Track Height selector and select the
timebase from the Track Timebase submenu.
Track Height pop-up menu
Alternate Playlist Timebases
When you change a track's timebase, you can
choose to apply the timebase change to that
track only, or to the active Playlist and all alter-
nate playlists for that track.
To configure a timebase change to affect
timebases of all playlists in a track:
Click the Timebase selector (or Track Height
Selector) and enable the Selection Changes Alter-
nate Playlists option.
Groups
When you change the timebase for an audio
track that is part of an active Edit group, all the
tracks in the group will change to the same time-
base.
Audio Region Location
In tick-based audio tracks, the location of an au-
dio region is determined by the region's start
point, unless the region contains a sync point.
If the region contains a sync point, the sync
point determines where the audio region is fixed
to the grid.
Marker Location
When creating markers and Selection Memory
Locations, you can specify whether they have an
Absolute (sample-based) or Bar|Beat (tick-based)
reference. For more information, see "Bar|Beat
and Absolute Reference" on page 706.
Chapter 33: Time, Tempo, Meter, Key, and Chords 669