Processing : Event Operations : Change Velocity

Change Velocity
For more information, see the following topics:
The Change Velocity command in the Event Operations window automatically adjusts Note On (attack) and Note Off (release) velocities for selected MIDI notes. Use it to make notes louder or softer, or to create crescendos or decrescendos.
Velocities can also be edited manually with the Pencil and Grabber tools (see Manually Editing MIDI Notes).
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You can also change velocity nondestructively in real-time using MIDI Real-Time Properties. See MIDI Real-Time Properties.