Trance variant built around the squelching, resonant TB-303 acid bassline.
Definition
Acid trance is a trance variant defined by the use of the Roland TB-303 (or its modern equivalents) to generate the squelching, resonant, modulated bassline that gives the style its name. The sound originated in the early 1990s as producers blended Chicago acid house with the emerging European trance template, with Hardfloor's "Acperience 1" (1992) often cited as a foundational document. Acid trance retains the steady four-on-the-floor pulse and breakdown-buildup architecture of trance while replacing the rolling 16th-note bassline with the 303's distinctive synthetic snake of cutoff and resonance modulation. The sound is closely related to acid techno and remains a niche but loyal sub-tradition within the wider trance world, with revivals appearing periodically through the 2000s and 2010s.