Boss DR-55 (1980)
The very first in the Dr. Rhythm series, and the most simple drum machine ever made by Roland. Featured 4 analog-generated sounds and a programmable rhythm sequencer.
Sounds
- Analog circuitry for sound generation
- 4 sounds: Kick, Snare, Rim, Hat
Sequencer
- Two 12 or 16 step patterns
- Manual rhythm programming
