All Purpose Audio consists of Tim Hammer, Frank Doesburg, Gerard Roemers and Berry Vledder. At first, the band had only three members, Tim, Frank and Gerard. They started playing covers of their favourite bands, but after a short while they decided to write their own songs. APA’s music is mainly dominated by Rock and Pop music, but it also has a few Funk and Blues characteristics. After playing for a full year the band decided they needed a solo guitarist, and Berry became the fourth member of the band.