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Actually, I just remembered a situation where he doesn't require eye contact. In the final book of the Dark Tower series, Roland comes across a creature named Dandelo who is described as an old man. Dandelo is heavily implied to be an avatar of It. He starts telling jokes until Roland is at the point where he's laughing hysterically to the point where he' near the verge of dying, if I recall correctly. And Roland is usually a dead serious person. It takes Stepehen King himself sending a note through another character to get the heroes out of the situation and find out Dandelo's nature (the note sent by King literally says "Here comes the deus ex machina!") It even briefly turns into a giant cockroach and then a clown as it dies.
So yeah, he can do it through sound too.
So yeah, he can do it through sound too.