The trademark sound of "acid" is produced with a Roland TB-303 by playing a sequenced melody while altering the instrument's filter cutoff frequency, resonance, envelope modulation, and accent controls. This real-time tone adjustment was not part of the instrument's original intended operation. Acid trance is the best known form of trance music in Belgium. The form was first showcased at the popular Antwerp Rave 24 in Belgium, and has created four national number one singles in the country since.
It is not uncommon to see many of the first Acid Trance artists featured on Goa Trance compilation albums. However, many of these artists never considered themselves part of the Goa or Psychedelic scene and these compilation albums were often done by their record labels who published Acid Trance alongside Goa artists.
Source: Wikipedia > Acid Trance
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