I think the video actually showed the audio cutting out when Mangrove’s air was below a certain level? With something patched into crease (or slope), I think survey might no longer have an effect on the crease output?
Anyway, here’s my guess on what’s going on: if you don’t patch in to crease but take output from it and send that to something you can watch or listen to, you’ll notice that you still get motion in the direction you expect, but as you cross noon there’ll be a big jump, and so you could imagine it doing the same thing to an incoming audio-rate signal, sort of introducing a bigger jump (so more high-frequency content) at each zero-crossing. I suspect that because this is an analogue design, in order to get sensible behavior, there has to be a bit of inertia near zero, so if your volume is too low, crease “can’t hear” whether it wants to jump positive or negative, so it decides to not move.
Aww man, almost forgot about your question: my guess is that on its own the crease section is not gonna be quite the same as a dedicated wavefolder, since there aren’t any parameters (like number of folds, offset) you can control from that part of the module. It might be possible to patch up a “wavefolder” if we use more sections…
