Karl-Heinz "Kalle" Trapp is a German former music engineer and producer, and owner of the Karo Studio in Münster.
The federal state North Rhine-Westphalia became breeding ground for most German metal bands in the 1980s, with Trapp being referred to as "one of the main power metal producers of the 1980s and '90s".
[2] According to Andy Ergün of Grinder, Trapp also recommended that No Remorse Records sign Blind Guardian to release their first record.
[3] Trapp also produced or engineered albums by thrash metal bands such as Sieges Even, Destruction,[1] and Paradox; death metal such as Malleus Maleficarum by Dutch Pestilence, as well as heavy metal and hard rock such as Mad Max, Saxon and Uriah Heep.
[2] When retiring as a producer, Trapp also closed Karo Studios.