Does a man's voice "soften" when he talks to a woman he's attracted to?

I keep hearing that a man will speak in a deeper voice when talking to a woman he likes.

But my ex bf use to have a softer tone when talking to me. Like a more gentle tone as apposed to marcho, masculine tones he would use with his friends.
Does a man's voice "soften" when he talks to a woman he's attracted to?
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