personally, I think the fold distortion yields the best results for this type of use, but I usually just use it as a filter in the mod section. placing an envelope on the “amount” param can be fun 
did you see this?
guessing you might enjoy
here’s a simple sine fold instrument using the mod section, too
sin fold.xrni (3.3 KB)
I like to use the distortion dsp module as a hard clipper/saturator/waveshaper, too. very useful for taming peaks and adding character/grit/warmth to all kinds of sounds