Roland System 100

Uniquely for the time, the System 100 didn't "lock in" the oscillators to fixed footages or pitches, allowing greater flexibility for sound design.

The System 100 is still sought-after due to its filter, sequencer and patching capabilities, though the oscillators can be unstable at the lower frequencies, and the keyboard is prone to mis-triggering and double-triggering if not used regularly.

The system was notably used by Mute Records label head Daniel Miller, who helped produce Depeche Mode's A Broken Frame; and by The Human League (MK1 incarnation).

Specifically, the albums Reproduction and Travelogue used a large System 100 (1 x 101, 2 x 102, 2 x 104, 1 x 103) multitracked to provide nearly all the arrangements, including drums and percussion.

The K2 Plan (Shekhar Raj Dhain) used it extensively in a similar vein, multitracked and with the sequencer providing odd syncopations and effects.