- 1986: Youthquake - Maximum Rock and Roll Compilation
- 1989: Nausea - They Don't Get Paid, They Don't Get Laid, But Boy Do They Work Hard LP
- 1989: Nausea - Squat or Rot Volume. 1
- 1990: Nausea - Extinction
- 1990: Nausea - Cybergod
- 1991: Nausea - More Songs About Plants and Trees
- 1991: Nausea - Lie Cycle
- 1992: Nausea - Discharged: From Home Front to War Front
- 1993: Nausea - Extinction: The Second Coming(rerelease)
- 1993: Thorn - Bitter Potion
- 1996: Crisis - The Hollowing
- 1998: Soulfly - Soulfly
- 2000: Dave Navarro - Trust No One
- 2002: Soulfly - 3
- 2004: Nausea - Punk Terrorist Anthology Vol. 1 (rerelease)
- 2005: Roadrunner United - The All-Star Sessions
- 2006: Stone Sour - Come What(ever) May
- 2007: Black President - Black President
- 2010: "Amebix" - Redux
- 2010: Stone Sour - Audio Secrecy
- 2011: "Amebix" - Knights of the Black sun 12"
- 2011: "Amebix" - Sonic Mass LP
- 2012: Stone Sour - House of Gold & Bones - Part 1
- 2013: Stone Sour - House of Gold & Bones – Part 2
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- Producer/Engineer credits
- 1994: Chaos B.C. remix (Sepultura)
- 1995: Sun to Sun (The Spitters)
- 1997: Kicks Joy Darkness (Karouac)
- 1997: Eye for an Eye remix (Soulfly)
- 1998: Tribe remix (Soulfly)
- 2012: No Rules EP (Lody Kong)
- Currently Roy engineers and mixes his own material at his private studio and has been working with other bands throughout the last couple years.
- Film Score
- 2004: Legion
- 2007: Shudder
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