When you make a noise from the voicebox, the noise is what's heard. It's modulated by the lips and tongue but the lips and tongue don't add noises, they just en

When you make a noise from the voicebox, the noise is what's heard. It's modulated by the lips and tongue but the lips and tongue don't add noises, they just envelope them. You have a point about "s" and "th" which is a whistling between tongue and palate.