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The Korg M1 is a 16 voice, 8 part multitimbral, music workstation, manufactured by Korg, from 1988 to 1995.〔 The M1 featured a MIDI sequencer and a wide palette of available sounds, which allowed for the production of complete musical arrangements. Outselling the Yamaha DX7 and Roland D-50, the M1 became the top-selling digital synthesizer of its time.〔 ==Overview== In its six-year production period, an estimated 250,000 Korg M1 synthesizers were sold,〔 〕 making the M1 Korg's most successful synthesizer until the release of the Korg Triton. The volume of M1's sales allowed Korg executives to buy back Yamaha's share of the company, a deal which had originated in the mid-1980s (though Yamaha kept making keyboard assemblies for Korg, the entire keybed is the same in M1, DX7 and several other Korg and Yamaha synths). The M1 was so popular that it was produced until the end of 1995, long after its successor T-series (the more advanced T1/T2/T3 workstations) was discontinued. The huge success of the M1 lies primarily in the quality of its sounds. Korg expanded on the Sample & Synthesis idea,〔 formally implemented on Korg DSS-1 in 1986: instead of classic analog subtractive synthesis where simple analog waveforms (square, triangle, saw, etc.) are produced by tone generators (oscillators) it uses overtone-rich complex digital samples of actual acoustic instruments and classic synths of the past, and applies full subtractive synthesis processing: filters, LFOs, envelope generators, digital effects, etc. The resulting sounds were rich, colorful and natural. The ability to layer up to 8 different tones (sounds) on top of each other, split them over the keyboard in any combination, and instant realtime access to crucial parameters such as attack, release, filter cutoff, LFO timing, etc., made the M1 easy to use. S&S synthesis, under different names, is used by many major synthesizer manufacturers today. The lower cost of electronic memory and faster processors allow current models to store much higher quality and longer samples, and to apply more signal processing. Roland's SuperNatural, Yamaha's AWM (advanced wave memory) and Korg HI (hyper-integrated) are some recent examples of synthesizers that use some form of S&S synthesis. The M1's synthesizer engine consisted of one or two digital oscillators per patch with sampled acoustic waveforms are stored in memory. A total of 16 oscillators were offered, leading to a maximum 16-note polyphony (using only single-oscillator patches). This reduced to 8-note polyphony when using double oscillator programs. The basic sample sound was then processed by a simple digital low pass filter, and then fed into the digital amplifier. Envelopes and LFOs, along with keyboard tracking, were the main controllers for those blocks. Because no interaction between the oscillators was provided (unlike Roland's 'structures,' for example), dual-oscillator patches essentially ran the two oscillators in parallel. The filter did not offer resonance, but the need for a dramatic filter was diminished by the onboard sample library's wide variety of acoustic, synth, and exotic sounds. The M1's internal 4 MB waveform ROM was a huge amount of memory by 1988 standards, when the typical amount of RAM memory in desktop PCs was 512 or 640 Kbytes. Waveform ROM contained sounds which are still in use even today, especially the compressed acoustic piano (used on countless records of the time and later adopted by dance producers), pick and synth basses, strings, realistic vocal samples, brasses, and acceptable drum kits. For the first time, ethnic and exotic sounds from world locales (particularly Asian) were offered as standard. Two presets from the M1 were used extensively in 90's house and rave music, namely "Piano16" and "Organ2." The M1 offered the ability to combine up to eight programs (patches) to play simultaneously on various key and velocity zones. This arrangement is called a 'Combi,' and allowed more complex sounds to be assembled and played via keyboard or MIDI. The integrated MIDI sequencer allowed up to eight polyphonic tracks to play internal or MIDI sounds simultaneously. The sequencer memory could be shared with the user sound area, allowing 100 user "Program" sounds and 100 user "Combination" sounds with 4,400 sequencer notes or a reduced 50 Program and 50 Combination user sounds with 7700 notes. The sequencer's pattern structure permitted memory saving by using patterns for repetitive regions. Though paltry by current standards, the M1's sequencer offered full track editing and quantization, making it possible to produce high-quality songs entirely within the machine. The combination of the patches with the sequencer functionality led to the M1's near ubiquitous presence in late '80s and early '90s. The M1 offered 2 independent effects engines featuring reverb, flanger, chorus, delay, etc. Previously, most synthesizers offered fixed-function effects blocks, such as chorus or delay, and rarely reverb. When using multiple patches at the same time (in Combi or Sequencer modes), all patches share the same effects blocks. This problem also affected workstations from nearly all manufacturers. The workstation featured minimalist physical controls, including a 40x2 character LCD, softkeys, a data slider, data entry buttons, and a 4-way joystick. The joystick combined two modulation sources and pitch bend: left/right adjusts pitch bend, up emits MIDI controller 1 messages, and down emits MIDI controller 2 messages. No arpeggiator was offered (a common omission until mid-90's) and the synth enforced patch-based programming instead of performance controls. No disk drive was integrated, so only MIDI SysEx dumps and memory cards provided methods to save sequences and programs outside the keyboard. All M1 models include 2 slots for expansion - one for sample ROMs and the other for patch/combi ROMs or RAM cards for saving sounds or sequences. Korg offered the MCR-02 128 Kilobit card and the MCR-03 256 Kilobit card for around $80–$150 list, as well as the four-bank MCR-04 MegaRam card with a capacity of 1 Megabit (128 kilobytes). These cards and the M1's internal memory all use 3V lithium cells which last ~5 years without needing to be replaced (CR2032 in the M1, and CR2016 in the memory cards). If the battery dies, sounds and sequences are lost. Factory Programs and Combinations are not stored in ROM, so the loss of battery power in the keyboard necessitates a data dump from a RAM card, a Factory Preload card, or a MIDI sysex data dump to restore the factory patches. Due to the M1's ability to add sounds via data cards, many voice cards were made especially for the M1, such as the well-known Synth cards. Original KORG cards came in two-card sets, one PCM containing waveforms (initial tones, or building blocks) and another programs and combinations, finished sounds. These sets extend way beyond internal PCM waveforms, although existing set is more than enough. Many aftermarket cards (Valhala and VoiceCrystal for example) produced single Program cards utilizing internal waveforms only. Because of the success of the M1's sales, an entire market grew around supporting this synth. This included the production of 3rd party manuals, new sounds, training videos, and hardware modifications. "We had more than 50 companies making aftermarket accessories and sounds in 1988" said Korg USA's Dave Goldberg, who then managed the Third Party Developers. "One such product was the Frontal Lobe by Cannon Research", which added more memory for sequencing and a floppy disk drive. Another was the M1 PlusOne, which added an additional 4mb of onboard sample memory. In May 2015, the M1 was released as a software synthesizer called the iM1 for the iPad. The original M1 circuitry is meticulously modeled and which can be programmed in the same way as the hardware M1 synthesizer. The software product adds new features of resonant filters and increased polyphony (which is no longer limited to 16). It also includes waveforms and programs from all cards ever produced by Korg for the M1. 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「Korg M1」の詳細全文を読む スポンサード リンク
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