In this article
Logic Pro MIDI effects sit before the software instrument and change the performance information it receives. Start with one effect, listen to its role and capture the processed notes when you want to edit the result directly in the piano roll.
Start with an instrument and a clear input
Create a software instrument track with a plain piano or synth and check that your keyboard plays it. Insert a MIDI effect in the MIDI FX area above the instrument slot. Keep the sound’s delay and reverb low while learning the chain. If no notes play, solve the input or track-monitoring problem before adding more effects.
Use Chord Trigger to map playable harmony
Chord Trigger can assign a chord to a single trigger key. Its Single mode transposes one memorized shape, while Multi mode lets you assign different chords to different keys. For a C-major exercise, map C, F and G major to three nearby trigger keys. Check the assigned range so you know which keys trigger chords and which pass through normally.
Turn those chords into a pattern
Place Arpeggiator after Chord Trigger to break the resulting chords into a sequence. Compare a slow rate with a faster one and listen to the available space between notes. Device order matters: processing the trigger notes first can produce a different result from processing the completed chords. Bypass one effect at a time so the cause of each change stays clear.
Control expression without losing the phrase
Use a velocity-processing tool only when it serves the performance. Try a narrower range if accidental loud notes distract from the rhythm, or preserve more variation when the instrument responds musically. Listen through the actual patch, because velocity may change brightness as well as volume. Avoid randomizing every parameter at once; it becomes hard to keep the useful parts.
Record the processed notes for editing
Logic’s Record MIDI to Track Here feature captures MIDI-effect output. Add it after the last MIDI effect you want included, using that slot’s menu, then record a short live performance. Effects after that point are not part of the capture. Inspect the new region to confirm that it contains the generated chord or arpeggio notes you intended to keep.
Compare the captured phrase without double processing
Keep a saved version of the original setup, then play the captured MIDI through the instrument with the generating effects bypassed or removed in a separate test version. Otherwise the written output may pass through the same transformations again. Edit the final note lengths and rests, and arrange the phrase where it supports the song rather than leaving it running continuously.
Try this in your project
Map C, F and G major in Chord Trigger, then add Arpeggiator afterward. Play a four-bar sequence and record the processed MIDI. Compare the captured part through a plain piano, remove one short phrase and listen to how the new gap changes the rhythm.
Quick reference
| Focus | What to try | What to check |
|---|---|---|
| Chord Trigger | Assign a shape or separate chords | The trigger keys produce the intended harmony |
| Arpeggiator | Process the chord output | Notes form a clear rhythmic pattern |
| Capture | Record after the chosen MIDI effect | The final notes are editable without guessing |
Work with Captain Chords
Use Captain Chords to sketch the harmony, edit its voicing and rhythm, then develop the arrangement in your DAW.
Captain Plugins 8 overview
See the update video for the current canvas and editing workflow.
Useful references
Common questions
Why does ordinary recording sometimes show only my trigger notes?
The recording point may be before the MIDI effects. Use the documented output-capture feature and verify the notes in the resulting region.
Does a MIDI effect change the audio recording itself?
It changes the MIDI performance before an instrument generates sound. Audio effects process sound afterward; those are separate stages of the chain.