Apple Logic Pro 7 - Manual (Page 345)

Chapter 8 Global Tracks 345
Transposition events are closely linked to the progression of the chord root notes in the
Chord track: Changing a chord root will be reflected in the Transposition track, and vice
versa. Any alteration or creation of a transposition event will generate or alter the
corresponding chord in the Chord track. All Apple Loops and MIDI Regions will be
pitch-shifted accordingly. MIDI Regions will only be transposed if the No Transpose
checkbox is deactivated in their respective Object Parameter boxes. The “zero position”
of the Transposition track is determined by the current key signature in the Signature
track. If the key signature changes during a song, the “zero position” of the
Transposition track changes accordingly. The Transpose track always displays the
difference between the Chord track and the Signature track at the appropriate chord
position.
Note: “Regular” Audio Regions (Audio Regions that are not Apple Loops) will not be
affected. Nor will Apple Loops that do not have a key definition (drum loops, for
example).
Handling Events in the Transposition Track
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 song position reaches the next transposition event during
playback.
Handling of transposition events works in a similar fashion to Tempo track events: They
are created with the Pencil tool, and can be moved horizontally (along the timeline) or
vertically (changing their transposition value) by dragging them with the mouse. Watch
the help tag during these procedures to see the exact transposition value and bar
position of that particular event.
If you hold Control-Option-Command while clicking in the Transposition track, a text
field will open, allowing direct entry of the desired transposition value. After pressing
Return, a transposition event of the typed value will be created at the clicked position.
To delete a transposition event, select it by clicking on the node itself (or the line to its
right) and press Backspace, or use the Eraser tool.
Transposition events can be copied using the standard Copy and Paste procedure or by
dragging them with the mouse while holding Option.