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In 1990, she implemented the L.C. Concept, the earliest in-theater digital sound system. L.C.Concept was first demonstrated in 1991 with an experimental re-release of the film Cyrano de Bergerac, directed by Jean-Paul Rappeneau. The first commercial release was done in late 1991 with the movie Until the End of the World, directed by Wim Wenders. Elisabeth Löchen worked on more than 30 films featuring a L.C.Concept soundtrack, including Basic Instinct, Cliffhanger, Silent Tongue, Heaven & Earth, The Lover, Arizona Dream, and Bitter Moon.
In 1996 she moved to Los Angeles and bounced between two continents, consulting for digital sound companies, including DTS. She wrote her first scripts.
In 1999, Lochen wrote, produced and directed her award-winning short Red Ribbon . This short was released theatrically in Los Angeles, Orange County and Palm Springs. It was also screened before Beyond the Clouds directed by Michelangelo Antonioni and sold in Europe and Japan . In 1999, Elisabeth Löchen was invited as an American film director in France for the Deauville US Films Festival . While travelling a lot with “Red Ribbon” she produced and directed shorts and documentaries until 2004 when she was hired by Front Porch Films to direct her first US feature, “Dirt People” with David Paetkau, James Farentino, and Briana Lynn Brown .
In 2006 she wrote and directed “Christian”  her first French feature  with Annie Girardot, Yvon Martin, Charles Nemes , Patrick Béthune, and Christian Morin . This "American awards winner" French movie (Best Director and Best Foreign movie) was premiered on the Champs Elysées. It was released theatrically in France in November 2007 only with D-copies. .
- The Film journal: Volume 96, Issues 7-12 1993 Elisabeth Lochen and Pascal Chedeville's LC Concept introduced at Cannes their independent subtitle system. This is a multi-lingual digital sound system with independent subtitles, stored on the same medium as the digital sound
- Cinéma: Issues 523-544 1994 "Les représentants du système français, Elisabeth Lochen et Pascal Chedeville, ont décidé d'abandonner la bataille en raison du manque de soutien de la part des pouvoirs publics."
- Grosse Medienchronik Hans Hiebel - 1999 "Das Verfahren, das ua in Europa zum Einsatz kommt, ist nach den Initialen der beiden Firmeninhaber, Elisabeth Löchen und Pascal Chedeville, benannt. [Blake, 95] 1991 "