That squelchy, almost wet, tone. That rising, insistent, jagged pitch. There are few more instantly recognizable sounds in dance music than acid. Few more pervasive, either—house, techno, trance, ...

What makes it acid: The TB-303’s slides, accents, and resonant filter created the squelchy, hypnotic sound that defined acid house and techno. Tools of the trade: From vintage hardware to modern ...