“fold” and “bits” are new mixing modes.
“fold” mixes both oscillator 1 and 2 equally, and applies a digital foldback distortion to it, the amount of which is controlled by “mix”.
“bits” mixes both oscillator 1 and 2 equally, and applies a bitdepth reduction to it, the amount of which is controlled by “mix”.
Another example in which the amount of distortion is controlled by a random mod source (per note).