[1] From an early age, Sax was interested in recorded sound, and although he had established a career as a symphonic trumpeter, on December 27, 1967, along with Lincoln Mayorga, a friend from junior high who had become a music arranger and pianist for Capitol Records, and Sax's older brother Sherwood (Bert), an engineer, he opened The Mastering Lab.

[2] The Mastering Lab uses equipment designed by Sherwood, which features handcrafted electronics, from the tape machines to the equalizers, compressors / limiters, A/D - D/A converters, and monitoring amplifiers.

[3] That, combined with his ears and expertise, helped Sax forge a long and successful career at The Mastering Lab.

[4] In 1970, Sax and Mayorga founded Sheffield Lab Recordings, an audiophile label which produced direct-to-disc classical and jazz albums.

During his career, Sax cut thousands of LP masters with his custom designed, all-tube signal path including Pink Floyd's The Wall (and all subsequent Pink Floyd releases up to 2014's The Endless River), the reissue of the Slayer thrash metal group's Vinyl Conflict box set and Pantera vinyl reissues, the Eagles' Greatest Hits, and Brian Wilson Reimagines Gershwin.