Boss DR-110 Dr. Rhythm Graphic Drum Machine with Original Case

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"Dr. Rhythm Graphic (DR-110) offers a wide selection of sounds, preset patterns, a large number of programmable patterns, and the ability to chain patterns together to form songs. The simple step programming is aided by an LCD grid showing the individual notes in the current pattern. In addition to step programming there is also a "tap write" programming mode.

This instrument is powered by a 9v adaptor (not included) or four AA batteries (also not included). The original manual can be download here.

The sounds are Kick, Snare, Closed Hi-Hat, Open Hi-Hat, Cymbal and Clap. The sounds are totally analog, and sound crisp and punchy, thanks to tone generation circuitry. A balance knob alters the level of the Kick, Snare and Clap relative to the other sounds, while an accent knob controls the amount of emphasis applied to accented steps. There is also a volume knob, which controls the overall level of both the main and headphone outputs. The main output is mono, but has an unusual feature whereby plugging in a suitable wired lead with a stereo jack plug allows for the feeding in of another signal to be mixed with the drum sounds. Another socket provides for a trigger signal, emitting a pulse for every accented step in a pattern.

The patterns are organized into four banks of eight patterns each. Banks C and D are the presets, while banks A and B are programmable. Each pattern can be switched between 12 or 16 steps, for a 3/4 or 4/4 time signature. Two songs can be programmed, each containing a maximum of 128 bars."