Matt Sour (aka App Sound) is a sound and music producer from Germany, based near Frankfurt. He loves making multi-layered arpeggio sounds and soundscapes like his daily cappuccino. Designing sounds often brings him to new musical ideas. Matt Sour moves in many sub genres of spherical electronic music. He offers his own presets for synthesizers via App Sound and is always active for well-known manufacturers. As a freelance journalist he regularly writes articles for the German press about music software and synthesizers.