The original 2004 release consists of the Korg MS-20, Korg Polysix and Korg Wavestation, and Legac圜ell, a VST which layers combinations of any of the past 3 synths mentioned. The Korg Collection 3 (Formerly Known as the Korg Legacy Collection and then simply the Korg Collection) is a collection of VST instruments from Korg and was released in 2004 with updates and more Synths added over time.
