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Change track colors in GarageBand on Mac
By default, each track type (audio, MIDI, Drummer) has a standard color, which makes it easy to visually distinguish track types in a project. You can also assign custom colors to individual tracks, to help visually identify tracks with different parts or different instruments. For example, you could make audio tracks with vocal recordings a different color than instrumental audio tracks.
Assign colors to tracks
GarageBand on Mac, select the track, then choose Track > Assign Track Color (or press Option-C).
The Color palette opens.
Select the track color in the Color palette.