The Hertz

 Anndd now, the real thing.... The Legendary Roland TB 303. An original good condition one could get you killed in some circles ;)

The Roland TB-303 Bass Line is a bass synthesizer with built-in sequencer manufactured by the Roland corporation from late 1981[1] to 1984 that had a defining role in the development of contemporary electronic music.

The TB-303 (short for "Transistorized Bass") was originally marketed to guitarists for bass accompaniment while practising alone. Production lasted approximately 18 months, resulting in only 10,000 units. It was not until the mid- to late-1980s that DJs and electronic musicians inChicago found a use for the machine in the context of the newly developing house music genre.