About Vengeance Sound Manuel Schleis is the producer and mastermind behind Vengeance-Sound, a Germany based company. Vengeance Sound delivers top notch sounds and tools used in electronic club music for over a decade. In 2008 together with Rene Keilwerth, Vengeance developed a VST effect and mastering plugin series which led to the creation of the powerful Avenger Virtual Synthesizer. http://www.vengeance-sound.com