Korg 900PS Preset Synthesizer (1975)
The Korg 900PS is quite a basic but very interesting monosynth. The 900PS definitely 'borrowed' some ideas from the Arp Pro-Soloist. Instant selection of 29 different tone colors. From the sweet sound of a violin to the chugging of a steam locomotive. Sensitive soft-touch switches and plentiful controls provide a wide variety of effects including vibrato, repeat, even the harmonics you need for a Hammond organ tone. The 900PS has 29 presets: Timpani, Electric Bass, Synthe Bass, Piano, Harpsichord, Shamisen, Banjo, Mandolin, Xylophone, Tuba, Bassoon, Horn, Cello, Trombone, Saxophone, Voice, Clarinet, Accordion, Trumpet, Funky Trumpet, Synthe Trumpet, Oboe, Violin, Recorder, White Noise, Scale Noise, Harmonics I, Harmonics II, Harmonics III.You can edit: Portamento, Repeat, Vibrato: Speed/Depth, Attack Control, Sustain Control, Harmonics Control, Traveler Control (filter cutoff), Pitch Bend, Forte, Volume.
Korg M500 Micro-Preset (1977-1980)
But overall this is a bit of a novelty synthesizers, and is not especially playable nor distinctive - apart from its looks! There are no MIDI, CV nor similar inputs.