All Pro Tools tracks can be switched between being sample-based or tick-based.Track height affects how various track controls appear in the Edit window. The Timebase selector, which is used for switching a track’s timebase, is only visible in Medium or larger track heights.
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If the track’s height is set to Medium or larger, click the Timebase selector for the track and select the timebase. The Timebase selector icon changes to reflect your choice.
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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.