Processing : Event Operations : Step Input Command

Step Input Command
For more information, see the following topics:
Step Input in the Event Operations window lets you use a MIDI controller to enter notes individually, one step at a time. This gives you precise control over note placement, duration, and velocity. With MIDI step input you can also create musical passages that might be difficult to play accurately, or at a fast tempo.
 
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Use Step Input to enter MIDI notes in the Score Editor or in MIDI Editor windows.
To enter MIDI notes with Step Input (using an external MIDI device):
1 Make certain your external MIDI device is properly connected and working with Pro Tools.
2 Choose Event > Event Operations > Step Input.
3 Select the Enable option.
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When Step Input is enabled, each previously record-enabled MIDI or Instrument track is taken out of record enable, and if the Default Thru Instrument preference is defined, it is disabled.
4 Choose the MIDI or Instrument track for step entry from the Destination track pop-up menu.
5 Choose the note value you want to enter from the Step Increment section.
6 Play a note or chord on your MIDI instrument. This enters the note and moves to the next step of the insertion point.
To increase a note’s length while using Step Input:
1 Play and hold a note on your MIDI instrument.
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When a note is being held on the MIDI keyboard, Next Step changes to read “Increment.”
2 Choose the note value that you would like to add and press the Increment button.
Release the note on your MIDI keyboard to move to the next step insertion point.