This is incredibly helpful and I will dive into this more tomorrow. Thank you for mentioning the FFT and filter areas! I have lots of tabs from the documentation open to read, but if there are any additional resources kindly send along 
Iāve googled / youtube searched āunreal engineā + Curves + FFT or Filter and am surprised not to see many resources. And none that I can find with respect to Metahumans or Facelink app (though that might be too specific).
Thanks again