According to Sound on Sound, none of the M1's features were unique at the time of release, but were implemented and combined in a new way. The M1 also features effects including reverb, delay, chorus, tremolo, EQ, distortion, and Leslie simulation, an innovative inclusion at the time. The timbres include piano, strings, acoustic guitar, woodwinds, sitar, kalimba, wind chimes, and drums. The sounds include sampled attack transients, loops, sustained waveforms without attack transients, and percussive samples. The M1 has a ROM with four megabytes of 16-bit PCM tones, including, according to Sound on Sound, "exotic instruments that previously hadn't been heard in the mainstream". The M1 features a 61-note velocity- and aftertouch-sensitive keyboard, 16-note polyphony with 1-oscillator Programs (or 8-note polyphony with 2-oscillator Programs), a joystick for pitch-bend and modulation control, an eight-track MIDI sequencer, separate LFOs for vibrato and filter modulation, and ADSR envelopes. It is the bestselling synthesizer in history, selling an estimated 250,000 units. The Korg M1 is a synthesizer and music workstation manufactured by Korg from 1988 to 1995. Spring-return joystick (pitch and modulation) Reverb, delay, phaser, tremolo, exciter, ensemble, overdrive, EQ, chorus, flanger, rotary speaker VDF (Variable Digital Filter), low-pass velocity sensitive (non-resonant)ģ independent AADBSSRR envelope generatorsġ00 programs / 100 combinations / 4400 sequencer notes or 50 programs / 50 combinations / 7700 sequencer notes depending on global settings, and 10 songs + 100 patterns 16 oscillators, 16 bit 2MWord (4MB) PCM waveform ROM (100 multisounds + 44 drum sounds)