Apple Logic Express 8 - Manual (Page 689)

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Transposition With the Chord and
Transposition Tracks
You can use the Transposition and Chord tracks to alter the
playback transposition of MIDI events and Apple Loops over
time.
The Transposition track contains nodes that are connected by vertical and horizontal
lines. Each node represents a global transposition event, which determines the global
transposition value—until the playhead reaches the next transposition event during
playback.
Transposition events are closely linked to the chord root notes in the Chord track: If
you create or alter a transposition event, the amount of pitch shift will immediately be
reflected by the chord root notes in the Chord track—and vice versa.
The zero position of the Transposition and Chord track is determined by the current key
signature in the Signature track. If the key signature changes during a project, the zero
position of the Transposition and Chord tracks change accordingly.