Your interpretations of "hum", and "giggle" being different from "chuckle" (tee-hee vs heh heh), are the same as mine. I tried using my mouth open and didn't g

Your interpretations of "hum", and "giggle" being different from "chuckle" (tee-hee vs heh heh), are the same as mine. I tried using my mouth open and didn't get significantly different results, though.