Synth1 is a software synthesizer designed by KVR user Daichi (Real name: Ichiro Toda 戸田一郎 [1]).

It was originally designed as an emulation of the Nord Lead 2 synthesizer, and has since become a unique Virtual Studio Technology instrument and one of the most downloaded VST plug-ins of all time.

Version 1.02 was released on October 27, 2002, and dealt with some of the major bugs that arose from converting the software to VST, such as a memory leak and the LFO waveform selector not working.

[5] One week later, on the first of May, 2010,[2] the now solely VSTi program was updated to version 1.09, which added a Phase Control function and expanded the number of voices in the polyphony and unison modes.

[8] The last update, version 1.13 beta, was released October 2, 2011, and allowed Synth1 to function on Macintosh operating systems.