The Roland Rhythm 55 (sometimes known by its model number, the Roland TR-55), is a preset drum machine (or "beatbox"), produced by Roland in 1972.
It was one of a trio of drum machines released by Roland that year, offering features intermediate between those of Rhythm 33 (TR-33) and Rhythm 77 (TR-77).
"TR" stands for "transistor rhythm".
The Rhythm 55 had analogue voice circuits to produce its drum sounds, and offered approximately 20 permutations of preset rhythms.
Read more about Roland Rhythm 55: Drum Sounds, Rhythm Patterns, Interfacing
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