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The Roland U-20 is a PCM-sample synthesizer, released by Roland in 1989.〔()〕 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.〔()〕 ==Overview== The synthesizer engine itself merely plays back stored PCM samples. Such a synthesizer is known as a rompler, as opposed to a sampler, which lets you record and load in custom samples. Nevertheless, sample playback can be slightly customized via editing its ADSR envelope and applying DSP effects, like reverb or chorus. A drawback is the absence of filters. The U-20 has standard 64 patches, and can be doubled with an optional RAM-card (the M-256E). Also there are 2 extra slots for ROM PCM-cards to expand the number of sounds. There's a built-in arpeggiator, a Chord Play feature which plays back a full chord with only one finger, 2 assignable sliders, and the U-20 is compatible with the SN-U110 and SN-MV30-S1 series of soundcards.〔()〕 With one U-20 it's possible to produce a reasonably complete orchestration. The maximum number of voices is then limited by the device itself. The U-20 has given certain Roland-sounds more publicity, like the shakuhachi, the bell, guitar-samples with distortion, and the typical Roland piano-sound, which can be found in later Roland models like the Sound Canvas series. Editing sounds is limited and relatively complicated due to the small screen and menu layout. Thanks to its popularity, later on there was software made available to edit sounds on a computer via MIDI, or by adding new sounds to the device.〔()〕 There are also hardware presets in programs like Cubase allowing easier communication. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Roland U-20」の詳細全文を読む スポンサード リンク
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