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Yamaha SY77 is a 16 voice multitimbral music workstation first produced by Yamaha Corporation in 1989. The SY77 is a synthesizer whose architecture combines AFM (Advanced Frequency Modulation) synthesis, AWM2 (Advanced Wave Memory 2) for ROM-borne sample-based synthesis, and the combination of these two methods christened Realtime Convolution and Modulation Synthesis (RCM). The same technology was also packaged in a rack-mounted module released simultaneously, the TG77. The SY77 is equipped with a 61-key keyboard with velocity and aftertouch; has a pitch wheel and two modulation wheels (the latter being quite a rare feature among keyboards in general); and has a large backlit LCD display, expansion slots, floppy-drive, on-board effects, and a 16,000 note sequencer. Programming is performed through a keypad on the front panel. When the SY77 was released in late 1989, its initial prices were close to $3000 USD/£2000 GBP. In 1991, it was followed by the SY99, a successor that cost ~$4000/£3000 and expanded its capabilities with a 76-key keyboard, the ability to load user-specified samples for AWM, a more advanced effects unit, and other features. ==Synthesis technologies== The AFM synthesis of the SY77 is effectively a superset of the 6-operator FM synthesis available on the Yamaha DX7 and DX7 II series of synthesizers. It is capable of all of the sounds that can be produced by those earlier keyboards – with various programs being able to automatically translate DX patches intelligently into accurate SY equivalents – and many more sounds besides. Among the advantages of AFM synthesis over FM synthesis are: a larger choice of algorithms, 15 additional waves besides the standard sine, which have additional harmonic content; 45 standard algorithms instead of the DX7's 32, plus a new ability to design one's own custom-routed algorithm using MIDI/SysEx; the flexible routing of up to three feedback sources within any algorithm, as opposed to the DX series' fixed algorithms with a single source each; the ability to route the FM signal through a configurable filter with the options of resonance and self-oscillation; and more. The SY/TG series also features Yamaha's now-flagship Advanced Wave Memory 2 (AWM2) technology for playback and manipulation of PCM samples, an evolution of the AWM included earlier in their TX16W. Such waveforms can be used as samples alone; can be layered with FM-based Elements, including using them as transients to FM-synthesized main waveforms, similarly to Roland's LA synthesis; or, in a feature unique to the SY/TG series, can be used as modulators for FM operators in place of elementary signals like the sine wave. These technologies, both alone and in combination (the latter giving rise to the name Realtime Convolution and Modulation), can generate rich, layered, multi-timbral sounds, and there are large libraries of patches available for the SY77. Sound sets on floppy disks are available online with patches and presets ranging from emulationis of classic synthesizers and ambient pads, to percussion and organ sounds. A single 720 kB (DD) formatted floppy disk can hold over 400 patches. The TG77 lacks the disk drive but can still load patches and settings via MIDI SysEx. However, software applications exist that can convert previously disk-only and thus SY77-only files into a TG77-compatible format. 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「Yamaha SY77」の詳細全文を読む スポンサード リンク
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