1st Roland U-20 synth (nederst i bild).

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The Roland U-20 is a PCM-sample synthesizer, released by Roland in 1988.[3]

The U-20 is described by Roland as a 'RS-PCM keyboard', where RS stands for ReSynthesized because the sound-engine can play back a modified version of stored PCM samples.

The U-20 is a digital synthesizer that uses ROM samples of pianos, brass, strings, bass, drums, etc. However it is built for professional use and is truly a quality instrument, even though its sounds may seem like dated-eighties synth pop cheese. It's got nice piano sounds, but they're not the real thing.

 The U-20 features 6 part multitimbrality with a 7th drum part, plus 2 direct outputs and 2 stereo outputs. The 30 note polyphony helps if you take advantage of this synths multitimbrality for creating entire performances and ensembles. Digital reverb, chorus and delay effects liven up your sounds. Editing is simple, but there are no filters. With several performance features, the U-20 has a full 61 note keyboard with velocity and aftertouch. There's an on-board arpeggiator, a chord-memory feature and the U-20 accepts Roland SNU-110 sound library cards. It has been used by Prodigy and Astral Projection.
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SPECIFICATIONS
Polyphony - 30 voices
Oscillators - 4MB ROM samples
Multitimbral - 6 parts + 1 drum part
Filter - None
Effects - Reverb, Delay, Chorus; arpeggiator
Memory - 64 patches, expandable to 128 with external RAM card
Keyboard - 61 keys (w/ velocity & aftertouch)
Control - MIDI