The 19" rack mount Roland U-220 RS-PCM Sound Module is derived from the Roland U-20 Keyboard External Link , first released in 1989. The U-220 is also described by Roland as a "Multi-Timbral Synthesizer Module". The RS in the model name stands for Re-Synthesized, as the synthesizer engine can play back a modified version of stored PCM (Pulse Code Modulated) samples. Sample playback can however be quite effectively customized via ADSR (Attack, Decay, Sustain, Release) envelope editing and also by applying DSP (Digital Signal Processing) effects.

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