Duplicates & variants

Recordings that hold more than one rendition of the same audio (matched by acoustic fingerprint). The best rendition by the quality ladder is marked. Tick the renditions to remove — Select non-best on a card ticks that recording's redundant copies, Select all non-best does it across every recording — then Delete selected sends them to Trash. Split off detaches a rendition into its own recording when the fingerprint grouped two genuinely different versions.