The VCS 3 (or VCS3; an initialism for Voltage Controlled Studio, version #3) is a portable analog synthesiser with a flexible semi-modular voice architecture, by Electronic Music Studios (London) Limited (EMS) in 1969.Note this product was called various names by EMS. For example, the printed logo written to the front left of products are: “V.C.S. 3” or “The Putney (VCS 3)” on the earlier version, then “The Synthi (VCS 3) II” on the later version (Synthi VCS 3 II).