When Roland released the MKS-7 in 1985, they solved a problem that sequencer users had been wrestling with: how to get multiple synth voices, bass, drums, and melodic control all from a single rack unit without needing a mixer full of separate modules. The answer was the Super Quartet, a compact 2U design that packed four independent sound sections into one elegant package.
The MKS-7 is built around Juno-106 circuitry, giving you analog subtractive synthesis across three synth sections plus a dedicated drum module. The melody section offers two voices of polyphony with a single digitally controlled oscillator per voice, while the chord section gives you four voices for harmonic textures. The bass section is a dedicated monophonic synth with its own voice. Each synth section features oscillators with sawtooth and pulse waveforms, pulse width modulation, a sub-oscillator, a resonant low-pass filter, ADSR envelope control, and an LFO for modulation. The rhythm block contains 11 PCM drum sounds sampled from the TR-707, including kick, snare, toms, hi-hats, and cymbals. All four sections can be assigned to different MIDI channels, letting you control melody, harmony, bass, and drums independently from a sequencer or keyboard controller. The unit includes 100 preset patches across the synth sections, individual outputs for each block plus a master stereo output, and built-in chorus on the synth sections.
The MKS-7 became a staple in MIDI-based studios throughout the late 1980s and early 1990s, particularly appealing to producers who wanted a complete rhythm and synth solution without rack clutter. Its straightforward architecture and reliable Juno sound design meant it aged well, and used units remain sought after by musicians who appreciate its practical workflow and the particular character of its analog filters. The main limitation is that it's MIDI-only with no keyboard, so you'll need an external controller, but that was entirely by design for sequencer-based production.
