He skyrocketed to fame after releasing a wealth of demo recordings and mastered albums with groups such as the Jimi Hendrix Experience, Gypsy Sun and Rainbow and Band of Gypsys.
"Jimi told me the music he had been recording at the time was elementary and he wanted a more intricate sound, " said Mr. Cox, who served in the Army with Hendrix and was a member of both the Jimi Hendrix Experience and Band of Gypsys.