What does the V key open?

The V key opens Duel or copy comparison depending on your selection. Merceq follows this order:

1. If two clips are selected: Duel opens.
2. If three or more clips are selected: copy comparison opens.
3. If you’ve already picked a Duel candidate: the clip under the cursor becomes the second candidate and Duel opens.
4. If the clip under the cursor has exact copies: copy comparison opens with all copies of the video; no Duel candidate is created.
5. If none of these apply: the clip under the cursor is marked as the first Duel candidate.