Chord Trigger overview in Logic Pro for Mac
The Chord Trigger MIDI plug-in lets you trigger chords by playing a single MIDI key. The onscreen keyboards have two functions: the display of incoming and outgoing MIDI notes and the assignment of chords to keys.
Chord Trigger parameters
Single/Multi Chord buttons: Click Single to assign a single chord to a trigger key. Play up and down the keyboard to transpose the memorized chord in relation to the trigger key. Click Multi to assign a different chord to each key on the keyboard. Single Chord mode mimics the Chord Memo or Note Stack feature found on many classic synthesizers.
Upper keyboard: Shows incoming MIDI notes, which are lit when played. Notes within the blue chord trigger range that have chord assignments are indicated by dots. Drag the handles above the keyboard to set the chord trigger range. Notes that fall within this range are processed. Notes outside the range are not processed. You can also click notes in the chord trigger range to trigger chords.
Note: Notes that fall within the chord trigger range that do not have chord assignments will not be heard, resulting in a dead zone on your MIDI keyboard. You should limit the trigger range to encompass only notes that you want to use for chord assignments.
Lower keyboard: Shows the resulting MIDI output—the chords triggered by incoming MIDI notes. The notes of each chord (in the chord trigger range) are displayed as blue dots when played. Notes outside the chord trigger range are lit when played.
Learn button: Turn Learn mode on or off. Click a trigger key on the upper keyboard. Click the notes you want to assign to the trigger key on the lower keyboard. You can set a MIDI keyboard note to act as a remote control for Learn mode in the Extended parameters. See Use Chord Trigger for details on using Learn mode.
Clear button: Erase a Trigger Key note and the corresponding chord.
Chord Transpose field: Drag vertically, click the up/down arrows, or click and type a transposition value for chord playback.