Silent Toast

Every time I butter toast, my Dad tells me off for being too noisy.  Not because he dislikes the sound, but because he has a theory that the more quietly you butter the toast, the more crunch it retains when you eat it.  He calls this technique “silent toast”.  It almost sounds plausible to me, but I’ve never actually tried loud vs silent in a single sitting to compare them.  What does anybody else think?