Clear Lane Set

Clears the current Lane Set.

Use Lane Sets in the Step Editor in Logic Pro — Apple Support

The Lane Set functions let you limit the Step Editor display to only the required MIDI event types. For example, imagine you have recorded a synthesizer lead MIDI region. You could create a Lane Set that contains individual lanes for each note pitch in the region. Drag each note event step vertically to adjust its level. Within the same Lane Set, you could create two more lanes to control the lead synthesizer’s filter cutoff and resonance parameters, allowing you to create or precisely edit filter changes.