Envelopes and LFOs, along with keyboard tracking, were the main controllers for those blocks. The basic sample sound was then processed by a simple digital low pass filter, and then fed into the digital amplifier. This reduced to 8-note polyphony when using double oscillator programs. A total of 16 oscillators were offered, leading to a maximum 16-note polyphony (using only single-oscillator patches). The M1's synthesizer engine consisted of one or two digital oscillators per patch with sampled acoustic waveforms are stored in memory. 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 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. S&S synthesis, under different names, is used by many major synthesizer manufacturers today. 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. The resulting sounds were rich, colorful and natural. 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 huge success of the M1 lies primarily in the quality of its sounds. 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 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). 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. Outselling the Yamaha DX7 and Roland D-50, the M1 became the top-selling digital synthesizer of its time. The M1 featured a MIDI sequencer and a wide palette of available sounds, which allowed for the production of complete musical arrangements. The Korg M1 is a 16 voice, 8 part multitimbral, music workstation, manufactured by Korg, from 1988 to 1995.
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