triggers. Samples, loops, and electronic textures were handled by Rhys Fulber throughout the album, with Reynor Diego contributing additional samples and keyboard parts. The music for "A Therapy for Pain" was originally written as the opening for "Echoes of Innocence" from the then-unreleased Concrete album. The outro passage was inspired by John Carpenter, Hijokaidan, and Aphex Twin. The use of organ in "Dog Day Sunrise" was inspired from a in-joke between Diego and Bell about The Doors. During post-production work with Richardson, Bell performed and added the organ parts to the track. The opening riff of the title track was voted 19th in Total Guitars list of "The Heaviest Riffs of all Time". The opening sample for "Pisschrist" and "Zero Signal" are both taken from Terminator 2: Judgment Day. Concrete also had a track named "Piss Christ", but the two bear no similarities other than the title. The original digipaks had slightly different artwork, most noticeably a different barcode on the front cover, and different colouring within the words "Fear Factory". The digipak was re-released in 2003 with all bonus tracks mentioned above, but with the new Roadrunner Records logo on the front and back and different lettering on the spine. This version is not limited, but has since been replaced by the remastered edition detailed below. In all, four different digipak versions of the album are available. Tracks 1 to 4 were featured on 2006's The Best of Fear Factory. In July 2013, the band toured Australia performing Demanufacture in its entirety. In celebration of the 20 year anniversary of Demanufacture in 2015, Fear Factory embarked on a tour across Europe and North America playing the album. Involvement of Christian Olde Wolbers Although Christian Olde Wolbers is credited as the bassist for the album and appears in the band photo, Dino Cazares has repeatedly claimed to have played bass himself on all tracks; because Olde Wolbers was not in the band during recording but joined before the album's release and promotional tour. However, his claims are partially contradicted by former drummer Raymond Hererra who has said that Olde Wolbers was a full member during production but did not perform on all tracks, due to Cazares re-arranging many riffs during tracking of his guitars. The band were behind schedule with recording and Olde Wolbers did not have time to learn the new arrangements so Cazares recorded bass on these tracks.