Ultrafold is a wave shaping module that uses wave folding and overdrive. In addition, the Wave Shift control shifts the center of the waveform from 0V, changing the way various waveform shaping functions are applied. AlsoFeedback controlBrings a dramatic change in the high frequency components by returning the output to the input. There is also an input for feedback, so you can put the sound of another oscillator here. Wave Fold, Feedback and Wave Shift can be controlled by CV.