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yes there's at least one way:
1. on the MIDI clip editor (aka. piano-roll) set "Pgm Change" for showing the events in the lower pane (usually showing "Note Velocity" as vertical bars);
2. set focus by clicking anywhere in there to and hit Ctrl+A (or menu Edit > Select All);
3. you may now Del(ete) all of them at once and save.
hth.
cheers