
Logic Pro for Mac Session Player Editor interface
If you add a track with a Session Player to a project, you can view and edit Session Player region parameters in the Session Player Editor.
The Session Player Editor shows settings for the selected Session Player region, including presets, controls adjusting the complexity and loudness of the region performance, and controls for editing performance parameters, including pattern variations and fill settings.
When a software instrument track with Session Player as the default region type is selected, you can select a style for the region in the Library .

Session Player presets: Choose a preset for the selected region. A preset consists of all region settings available in the Session Player Editor. You can use the default settings, or you can edit them and save your own presets.
Complexity and Intensity sliders: Adjust the complexity and loudness of the region performance.
Performance controls: Adjust the amount and complexity of fills using the Fills Amount and Fill Complexity knobs. Adjust the shuffle feel of the region performance using the Swing knob. Click the Details button to reveal additional performance controls.
Open the Session Player Editor
Double-click a Session Player region in the Tracks area, then click the Editors button
in the control bar..
Select a software instrument track with Session Player regions, then click the Editors button
.
The Session Player Editor opens below the Tracks area.