The Kurzweil K2000 is a digital synthesizer and music workstation produced by Kurzweil Music Systems between 1991 and 2000 in a variety of standard configurations, including rack-mountable versions and models that came with 16-bit user sampling.

The K2000 features a complex digital synthesis architecture dubbed V.A.S.T., which stands for "Variable Architecture Synthesis Technology", Kurzweil's marketing term for the digital signal processing (DSP) sound processing system used in the K2000 and other members of its K2xxx series.

stands for variable-architecture synthesis technology.

It is variable in that the user can select different signal paths, which contain different DSP functions, for use in creating and shaping a sound.

also includes an extensive modulation system, similar in concept to that of analog modular synthesizers.