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Anne Beetem Acker

[Doctor Rhythm]

Electronic percussion instrument released in 1980 and manufactured by the BOSS division of Roland. Very popular, small, inexpensive and easy to use, the Dr Rhythm model DR-55 was one of the first drum machines to use ‘step-write’ programming, where in ‘write’ mode the user can select a sound and use buttons to move incrementally (‘step’) through each beat of the beat pattern and select a choice of sounds. It can store up to six 16-step drum patterns and two 12-step patterns, the latter for triple-metre rhythms. Its four (analogue) voice-circuit sounds are snare, kick drum, rim-shot, and hi-hat. The pattern can be switched during playing, and volume, tempo (45 to 300 beats per minute), tone, and accent can be globally adjusted. The DR-110 Graphic (1983) adds a graphic display showing a step-programming grid for the drum voices, and includes 16 preset patterns plus 16 memory locations for user-programmed 12- or 16-step patterns, plus two ‘song’ memories for up to 128 bars of patterns. Its drum sounds can be programmed or played in from drum pads....