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The Prophet-5 is an analog synthesizer that was manufactured by Sequential Circuits in San Jose, California between 1978 and 1984. Introduced at the Winter NAMM show in January 1978, the Prophet-5 was groundbreaking in that it was one of the first analog synthesizers to implement patch memory, a feature that stored user settings of every parameter on the synthesizer into internal memory. It is also one of the first polyphonic synthesizers, with a maximum polyphony of 5 voices, meaning that up to 5 notes can sound at the same time. Like the Minimoog, the pitch wheel was not spring-loaded, but had a detented mechanism that clicked every time it was centered. The Prophet-5 was also known for its modulation capabilities. The "Poly-Mod" feature routed the output of the filter envelope generator and the second oscillator in each voice through two mixer knobs, which could then be connected to the pulse width and pitch controls on the first oscillator, to the filter cutoff frequency control, or all three at the same time. The second VCO was not limited to operating an LFO, allowing the Prophet-5 to generate 2-operator FM synthesis and ring modulator-style effects, as well as complex sweeping sounds. Three revisions were produced, the first two (commonly referred to as Revision 1 and Revision 2, respectively) using chips manufactured by SSM (Solid State Micro Technology for Music), and the last one (Revision 3) using Curtis CEM chips from Curtis Electromusic Specialties. The total number of production including all revisions was nearly 6,000 units. ==Oscillators== Early Prophet-5s, known as Revisions 1 and 2, used oscillator, filter and amplifier chips manufactured by SSM. Revision 3 instruments used Curtis CEM chips. Some owners maintain that SSM oscillators produced a richer timbre. However, the SSM oscillators rendered the instruments unstable and prone to detuning over time. The most common—and stable—of the three revisions was the third. Later Revision 3s were available with MIDI in and out ports, which were not available in the earlier revisions.〔Peter Forrest, The A-Z of Analogue Synthesisers Part Two, Short Run Press Ltd, 1996, p. 114〕 The Prophet-5 is noted for rich sound textures and 5-voice polyphony. It is also capable of generating brass sounds, as well as bell and atonal sound effects. The characteristics of Sequential Circuits' signature sound quality were a result of the interplay of oscillators and filters in Sequential's poly-mod section.〔Julian Colbeck, Keyfax Omnibus Edition, MixBooks, 1996, p. 123〕 Sequential Circuits also manufactured a larger version of the Prophet-5, known as the Prophet 10, which featured two keyboards and 10-voice polyphony. Early products occasionally overheated and went out of tune.〔(【引用サイトリンク】publisher=Vintage Synth Explorer )〕 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「Sequential Circuits Prophet-5」の詳細全文を読む スポンサード リンク
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