This walkthrough from Mastering.com breaks down Logic Pro 11's Chord Track, the control center for everything Session Players perform melodically.
Double click any chord to swap it out, adjust the voicing, or change the bass note underneath. You can type in a chord by name, input it via MIDI, or preview how it sounds before committing.
Ungroup chords to build a custom rhythm, deciding exactly when progressions change instead of relying on a fixed grid.
Changing the project key transposes the whole progression automatically, keeping every Session Player locked into the same harmonic framework.