Korg was the first company to feature effects on a synthesizer, and the first to use a "sample + synthesis" sound design. The M1 workstation, released in 1988, sold over 250,000 units, making it the bestselling synthesizer ever at that time.
The Korg M1 is the bestselling synthesizer in history. It was released in 1988 and manufactured until 1995, selling an estimated 250,000 units.  Sound on Sound wrote that it "can rightly be called the most popular synth of all time".