The Overfolder uses a new concept of wave folding, composed of 5 stages of CV controlled folding, which allows, in addition to conventional folding, the control of a second fold over the previous one. With this a new diversity of timbres is obtained, previously impossible with conventional circuits. To accomplish something similar the use of two independent wave folding modules would be required. The Fold, OverFold, and Symmetry controls can be operated via the external CV through their inputs.