The "Tauro" albums contain outtakes from the 1998 masterpiece Tauromachine (Relapse/Release) and unused material from the same period - the "O" in the title standing for "Outtakes." While the 10CD box Merzmorphosis (Youth Inc., 2012) previously compiled much unreleased 1996-97 material, it excluded recordings related to 1930 and Tauromachine. This "Tauro" material appears here for the first time.

The equipment list reveals Akita's expanding palette: Moog Rogue, Theremin, Novation Bass Station, TR-606, and the EMS Synthi 'A' acquired in late 1994. An unusual addition is the BIAS Rockaku-Kun EXD Electronic Drum Unit. Tauro-O1 includes a long version of "Cannibalism of Machine" from Tauromachine, offering extended immersion in one of the era's defining compositions.