The double monochord has two string sides with two different ground notes that are in a fifth distance to each other. You can play both sides individually or at the same time. Due to the large number of strings, the overall sound of the double monochord is somewhat more powerful and richer in overtones than that of single-monochords. When playing with other instruments, the different basic tones give you a little more creative freedom in the accompaniment.
The Meerklang double monochords are strung with 50 to 60 strings, depending on their length.