Logic Pro X: Scrub the project
You can scrub a project to locate or listen to a sound at a particular point in time. When you scrub a project, you quickly audition it by moving the playhead across the Tracks area. The speed at which you move the playhead controls the playback speed. Scrubbing makes it easy to zero in on a particular drum beat or other audio event before cutting or editing a region.
Scrubbing always applies to MIDI regions in the Tracks area. When the Scrubbing with audio in Tracks area preference is active, audio regions are also scrubbed. Muted tracks and regions are not scrubbed, so you can control which tracks and regions you hear by muting or soloing them. For information about Scrubbing with audio in Tracks area, see Audio Editing preferences.
Scrub the project
If necessary, zoom in or out to view the section you want to scrub.
Click the Pause button in the control bar.
Grab the playhead in the Tracks area or the ruler, and move it back and forth through the parts of the project you want to hear, at the speed you want to scrub the section (or use the Scrub Rewind and Scrub Forward key commands).
Note: If the Pause button is not visible in the control bar, you can show it by customizing the control bar.
Scrub specific audio regions
Select the audio regions, then scrub the project.
Only the selected audio regions are heard. All unmuted MIDI regions are also heard.
Turn on scrubbing for MIDI regions
Choose File > Preferences > Audio > Editing > Scrubbing with audio in Tracks.
Scrub using a MIDI controller
Assign any MIDI controller number to the Scrub by MIDI value (-2-) function.
With this assignment, data bytes over 64 scrub forward, and those under 64 scrub backward. For more information, see the Logic Pro Control Surfaces Support manual.
You can also scrub via external MIDI control (such as a control surface or keyboard controller) using the Scrub by MIDI value (-2-) function (available in the Controller Assignments window; see the Logic Pro Control Surfaces Support manual). Any MIDI controller number can be assigned to this function. Data bytes over 64 scrub forward, and those under 64 scrub backward.
Note: Scrubbing is automatically made active when you split regions with the Scissors tool in the Tracks area, making it easier to identify the cut position.