In Logic Pro, choose one of the following scale units from the Audio File Editor’s View menu:
Samples: Displays the number of samples.
Min:Sec:Ms: Displays the absolute scale in hours, minutes, seconds, and milliseconds.
SMPTE Time: Displays the SMPTE scale in hours, minutes, seconds, and frames.
Bars/Beats: Displays the scale in bars, beats, divisions, and ticks.
Tip: You can also access these options via a shortcut menu by Control-clicking the ruler.
Download the guides:
Logic Pro User Guide: PDF
Logic Pro Effects: PDF