It was his skill behind the console, recording and mixing musical scores for movies and TV, that won him legions of fans among nearly all of Hollywood's top composers and ensured steady employment for more than half a century.
He had worked on more than 500 films since 1965, working into his eighties.
After the war, he worked in live radio, handling big-band remotes from popular L.A. venues for CBS, and then moved to television, working at KTLA in the 1950s.
He won a 2009 Emmy for sound mixing on the Academy Awards telecast and received two additional Emmy nominations in the sound mixing category (1992's "Citizen Cohn," 1996's "Gotti").
Wallin grew up in a Van Nuys orphanage, learned to play drums, and later served as a Navy aviation radio operator during World War II.