OMG! i just learned about the SICKEST CV modulator ever, because it works almost exactly the same way it would if i designed it, and i imagined a module very much like it, only it wasn't step based, though, when you can alter the timing of every step, it's the next best thing to hand drawing, my module would be used to modulate notes, so you can play your "boings, wobbles & scratches" and my modulator would add a second layer for amplitude modulation for extra complex sounds, but i guess if you synced a couple expanders, you could modulate a VCA & a VCF, all with entirely different envelopes than pitch, besides patching your CVs to "whatever it is you modular heads do" said he with an accusatory tone. LOL
anyways, check control forge out. it's only 100 times cooler than maths or rampage and at least 10x cooler than pamela's workout (as far as i understand it anyways)
https://www.modulargrid.net/e/rossum-electro-music-control-forge