Apple Logic Pro 8 - Manual (Page 665)

Chapter 32 Editing Transposition With the Chord and Transposition Track 665
Analyzing MIDI Regions
You can use the Analyze button in the Chord track to analyze the chords in a MIDI
region. Select the desired MIDI region (preferably one containing complete chords) and
click the Analyze button in the Chord track header. The MIDI region will be analyzed,
with the resulting chords appearing in the Chord track. This also works for several
subsequent regions. Alternatively, you can drag the desired regions onto the Chord
track.
Note: Keep in mind that the chords in the Chord track are events, they affect the
playback transposition of MIDI events and Apple Loops. Make sure that you only use
the Chord track if you really want to use it consequently; once you use it, it always
affects your composition. As an example: When you analyze your project, then copy a
region without copying the chord track events …; you should not use it if you only
want to display the chords in your project; use the Marker track then—or the Score
Editor text chord symbols.
Working in the Change Display Only Mode
You might come across situations where there are incorrect or missing chords in the
Chord track. As an example: You record a MIDI region, select it and use the Chord
track’s Analyze button. Normally this should work fine, as the analysis algorithm is
rather intelligent and knows all about harmonics. If the result of the analysis process
unexpectedly doesn’t comply with your recording, Logic Pro provides you with an easy
solution: The Chord track’s Change Display Only mode. If you activate this mode by
clicking the Change Display Only option in the Chord track, you will be able to adjust
the chords to match what you’re actually hearing (the transposition events in the
Transposition track are adapted accordingly). All changes applied to chords in the
Chord track while the Change Display Only mode is active, will have no result on the
playback of the corresponding MIDI regions—these changes will only adapt the chords
displayed in the Chord track to match the chords played in the MIDI region.
The Change Display Only mode does not work with Apple Loops used on audio tracks.
For further information, see the Chord track description in the Apple Loops chapter on
page 621.