Ensoniq Mirage DSK-8 Digital Sampling Keyboard w/USB Drive

From Wikipedia:

The Mirage is an 8-bit  featuring 8 voices of polyphony, 16 oscillators (or 32-oscillator wavetable synthesis upon loading alternative operating system), analog resonant Curtis CEM3328 4-pole 24db/octave filters, a 61 key velocity-sensitive keyboard or else 2U rack-mount module case, multi-sampling (up to 16 samples across keyboard), multi-timbral operation, extensive  implementation, a two-digit LED display, a 333-event . It has 128kB of RAM (64kB for each keyboard half) and it is not expandable. Sample rate is variable from 10 kHz to 33 kHz (up to 50 kHZ with optional Ensoniq Input Sampling Filter) with available sample time ranging from 2 to 6.5 seconds accordingly (for each keyboard half).

It includes a built-in 3.5 inch SS/DD  drive, which is used to boot the operating system as well as to store samples and sequences. Each disk has a copy of the  and can be used as a boot disk, obviating the need for a separate boot disk.

Each disk stores six separate files of samples and up to eight sequences. The keyboard is pre-configured into two halves, each functioning as two independent instruments, though the split point can be moved. This makes it easy to have one sound for the right hand (an upper sound) and another for the left (a lower sound). However, the standard OS can not move samples between keyboard halves. Thus the diskette can save three upper sounds and three lower sounds. Ensoniq later made an alternative OS available called MASOS which trades off performance features for editing features, including the ability to copy an upper sound to a lower sound and vice versa.

Using a feature called multi-sampling, the Mirage is also capable of assigning multiple samples to different keys across its keyboard. Using this technique, the Mirage essentially turns into a polyphonic multi-timbral MIDI sound module complete with a velocity-sensitive keyboard that can be used to drive other MIDI sound modules as well its own sound engine.

Alternative 3rd-party operating systems which substantially change and expand the synthesis capability and utility of the Mirage were produced.

The Mirage sampler has a distinctive sound due its low bitrate converters, analog CEM3328 filters, and ability to load alternative operating systems that expand its capabilities to a 32-digital-oscillator wavetable synthesizer with user-definable sampled wavetables.