Wersi

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Wersi is a German manufacturer of electronic organs, keyboards, and pianos. It is named after the communes of Werlau and Simmern in Rhineland-Palatinate. They were used by organists such as Franz Lambert and Klaus Wunderlich.

The brand's current range of instruments uses the Open-Architecture-System (OAS), which is a GUI that runs using a Windows XP computer, enabling the keyboard to support third-party programs, such as music notation programs, software synthesizers, and digital audio workstations.