F_FOLDR is a so called Wavefolder that takes a signal and flips the signal above a certain threshold. The louder the input signal, the more the folding begins to occur. The number of 'FOLDS' can be set with a knob. Further there is a SMOOTH knob to smooth the signal if needed. For both FOLD and SMOOTH there is also a modulation input and knob to set modulation amount. The central MIX knob lets you mix between the original input signal and the folded signal and can be modulated. The TYPE switch lets you choose between two Folding output signals.