Contributions
He contributed upright bass to Devin Townsend's second album Infinity in 1998. In 2006, he helped produce and mix Mnemic's third album, Passenger, and also produced Bleed the Sky's Murder the Dance and Threat Signal's debut album, Under Reprisal. In 2008, he produced End of the Rope's new album, Till It Bleeds and in 2009, Wolbers produced Years in the Darkness for Arkaea. He filled in as live guitarist for Korn for the first three shows of their European tour. He appears as a guest guitar player on the EP This World by breakbeat production group The Autobots. He produced the vocals for God Forbid's Earthsblood, co-wrote and played bass on Snoop Dogg's album Paid tha Cost to Be da Boss. He helped Cypress Hill with their rock outfit and wrote songs for their Stoned Raiders and Skull & Bones albums. He also played on two songs on Soulfly's debut in 1998.
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