EFX Systems was a Burbank-based sound editing company that was largely in business during the 1980s and 1990s, specializing in digital audio post-production.
- Dragon's Lair
- Wildrose (1984) (in collaboration with Skywalker Sound)
- Hollywood Hot Tubs (1984)
- CBS Storybreak
- A Field So White (1984)
- Pray for Death (1985)
- The Berenstain Bears (1985 TV Series)
- Student Confidential (1986)
- Teen Wolf (1986 TV Series)
- Amazing Stories (one episode - "Family Dog".)
- Munchies (1987)
- Stripped to Kill (1987)
- New Monkees
- Mighty Mouse: The New Adventures
- Code Name Zebra (1987)
- Real Bullets (1988)
- Mad Scientist (1988)
- Freddy's Nightmares
- Torch Song Trilogy (1988)
- Felix the Cat: The Movie (1988)
- Christmas in Tattertown (1988)
- Talk Radio (1988)
- Son of Dinosaurs (1988)
- Party Plane (1989)
- Marvin: Baby of the Year (1989)
- Girlfriend from Hell (1989)
- Hound Town (1989)
- The Nutt House
- Best of the Best (1989)
- To Sleep with Anger (1990)
- Waiting for the Light (1990)
- The Platinum Triangle (1990)
- Cartoon All-Stars to the Rescue (1990)
- Hollywood Dog (1990)
- Parker Kane (1990)
- Darkman (1990)
- Peter Pan and the Pirates
- Frankenstein Unbound (1990)
- Stephanie Hodge: Straight Up (1991)
- Final Approach (1991) (Digital Re-Recording)
- Critters 3 (1991)
- Freddy's Dead: The Final Nightmare (1991) (music mixdown only)
- The Last Halloween (1991)
- Sweet Justice (1991)
- Poison Ivy (1992)
- FernGully: The Last Rainforest (1992) (in collaboration with Skywalker Sound and JDH Sound)
- Deep Cover (1992)
- Live Wire (1992)
- Me Myself & I (1992)
- Children of the Corn II: The Final Sacrifice (1992)
- Hellraiser III: Hell on Earth (1992)
- Critters 4 (1992)
- Goof Troop (one episode - "Hallow Weenies.")
- Bill & Ted's Excellent Adventures (1992 TV series)
- SWAT Kats: The Radical Squadron
- Babylon 5
- Wide Sargasso Sea (1993)
- Surf Ninjas (1993)
- The Mask (1994)
- Sailor Moon S: Hearts in Ice (1994) (English dub; in collaboration with Soundstorm)
- What a Cartoon! (two episodes - "Yoink of the Yukon" and "Podunk Possum.")