In 1988, inspired by the Peter Weir film The Last Wave, Roach journeyed to the Australian outback, with field recordings of aboriginal life inspiring his acknowledged masterpiece, the double-album Dreamtime Return. A year later, he teamed with percussionist Michael Shrieve and guitarist David Torn for The Leaving Time, an experiment in ambient jazz. After relocating to the desert outskirts of Tucson, AZ, Roach established his own recording studio, Timeroom, and in the years to follow grew increasingly prolific, creating both as a solo artist and in tandem with acts including Robert Rich, Michael Stearns, Jorge Reyes, and Kevin Braheny -- in all, close to two dozen major works in the 1990s alone, all of them located at different points on the space-time continuum separating modern technology and primitive music.

His album roster from that decade includes Strata (1991), Artifacts (1994), Well of Souls (1995), Amplexus (1997), and Dust to Dust (1998). Early Man was released on Projekt in early 2001, followed by one of his many collaborations with Vidna Obmana, Innerzone. Throughout the remainder of the early 2000s, Roach remained extremely prolific, with his release schedule including the Projekt titles Trance Spirits (with Jeffrey Fayman), the quadruple-disc Mystic Chords & Sacred Spaces, Spirit Dome and Somewhere Else (with Obmana), Fever Dreams, Mantram, and Nada Terma (with Byron Metcalf and Mark Seelig), the three-part Immersion series, Arc of Passion, and Stream of Thought (with Erik Wøllo). He also self-released several titles on his own through Timeroom Editions.