In 1969 Dorren invented the Quadraplex system[1] of single station, discrete, compatible four-channel FM broadcasting.
He founded Quadracast Systems, Inc. (QSI) of Palo Alto, California, United States to license his patents to RCA and others.
[8] Dorren was well known to the organizers of the Westcoast Songwriter's Conference, with him and his company sponsoring and supporting the event for years.
[9][10] At the 26th annual conference, he hosted a segment in the Xytar room on how to make home recordings sound professional.
[15] In the 2000s he was the CEO of Xytar Digital systems, a company located on Taylor Boulevard in Millbrae, California.
Later with Kensington Forest which was a Banshees incarnation of sorts, he produced another single called "Movin’ On" bw "Bells".
[25][26][27] In 1995, Slyest Freshest Funkiest Rarist Cuts by Sly & The Family Stone was released on the Magical Mystery label.
[29][30][31] Later, he worked on another Ronny Cox album, How I Love Them Old Songs..., as Engineer and handling the Mastering and Mixing.
[32][33] Decades later after The Beau Brummels had broken up, remaining members of the band got together with Dorren and recorded a new album that was released on his Bay Sound label in 2013.
Sadly Dorren's wishes for all the original members to record weren't possible as the drummer John Petersen died in 2008.
[38] In 1974, Dorren who was still a college student at the time assisted radio station owner Jim Gabbert in the broadcast.
As a result of the tests, an application for discrete quad broadcasting was made to the (FCC) Federal Communications Commission.
Along with radio engineers there were people from companies such as General Electric, Zenith, Nippon Columbia and RCA, and Quadracast Systems.
Other guests included Claude Hall from Billboard Magazine, Casey Casem, and Tom Rounds.