Kalle Trapp - Producer, Sound Engineer, Musician
1985 Railway II, Railway (DEU)
1985 Weapon of Love, Paganini (CHE)
1986 Hero's Tears, Sortilège (FRA)
1986 Winds of War 1986, Iron Angel (DEU)
1987 Mad Butcher (EP), Destruction (DEU)
1987 Night of Passion, Mad Max
1987 Product Of Imagination, Paradox (DEU)
1987 Release from Agony, Destruction (DEU)
1988 Battalions of Fear, Blind Guardian (DEU)
1988 Malleus Maleficarum, Pestilence
1988 Reality Turns to Dust, Drifter (CHE)
1989 Follow the Blind, Blind Guardian (DEU)
1990 Heaven Can Wait (EP), Gamma Ray
1990 Tales from the Twilight World, Blind Guardian (DEU)
Samain - Vibrations of Doom 1984
Sieges Even - Lifecycle 1988
Violent Force - Malevolent Assault of Tomorrow 1987
Guest Musicians, 1990 Tales from the Twilight World, Blind Guardian (DEU)
Karo Musikstudio, Münster
Kai Hansen - Vocals, Guitars
Rolfi Köhler - Sound Engineer
Piet Sielck - Vocals, Guitar, Sound Engineer
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Kalle Trapp - Producer, Sound Engineer, Musician
Karl-Heinz Trapp