Arturia BeatStep Pro MIDI/Analog Controller and Sequencer Kit with CV/Gate Cables (Black) - Manual (Page 113)

10.7.5.3. Copy/paste events
After selecting a group of events you can make another copy of those events in another
section of the pattern. Just hold the Alt key (Option on a Mac), select one of the events, and
drag them all into the new area.
The new events will have the same velocity and gate time values as the original events.
10.7.5.4. Event velocity
If you click on the top of an event you will see the cursor become a vertical arrow icon. Drag
the cursor up and down to change the velocity of that event to a value between 1 and 127.
The color of the selected event will change to indicate the velocity value: white is the lowest
velocity value and red is the highest velocity value.
When the velocities of multiple events are edited at the same time they will all change to the
same value.
10.7.5.5. Event length/Gate time
If you click on the right edge of an event you will see the cursor become a horizontal arrow
icon. Drag the cursor left and right to change the gate time of that event to a value between
0 and 99%.
Arturia - User Manual BeatStep Pro - MIDI Control Center 108