This question is about copying only the arp only.

Figured out how to do it. You need to be in the “MIDI arp setup” menu (the one that shows the arpeggiator pattern, entered by double-pressing [AMP]) AND in grid recording mode (“record” button is red, entered by pressing [REC]).

When in this mode, pressing [fn] + [copy] copies the MIDI arp settings; then, you can go to another pattern and paste the MIDI arp page.

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