The treatise makes use of the monochord to explain interval relations. This tuning is based on a division of the monochord length into formula 1 parts. A version of the Trautonium, called the Monochord, was created for the studio. Initially, the Monochord and Melochord were used in the Cologne Studio together with other equipment. The Japanese ichigenkin, a monochord zither, is believed to be derived from the qin. The novike is a monochord which is bowed with a string bow, called "checne'c".