Mark Mangini served as The Final Frontier's sound designer; he had previously worked on The Voyage Home. Because Mangini was concerned about creating continuity within Star Trek's sounds, he decided to reuse some effects rather than create new and different-sounding ones — as such, the Bird of Prey's cloak effect, beaming sounds, and the Enterprise engines sound similar to past movies. Mangini collaborated with Shatner to work out how the completely new effects would sound. For Sybok's mind melds, Shatner wanted the sounds of beating hearts and breathing.
Mangini was also responsible for the film's foley and dialogue replacement; foley editors created background audio in sync with actions on screen to enrich the soundscape. The sound of Klingons walking, for example, was conveyed with chains and leather for a "rough" sound.