This is a used 360 Systems Digital Keyboard, an early and really digital keyboard/synth.
The keyboard plays samples stored on a huge amount of EPROMS banks. There's up to 8 voices polyphony with a layer of 2 sounds with volume balancing and 1 single modulator LFO for vibrato (frequency can be set)
Presets cannot be changed much but filter cutoff (analog LPF), pitch adjustment or set to lower and higher limits splits, layer swap, transpose.
Presets include samples from Bosendorfer Grand piano, strings, vibraphone, guitars, fretless bass, slap bass, various brass and woodwinds like trumpet, saxophone, bassoon and clarinet.
This is a truly unique instrument, and it sounds fantastic!