Tongue mapping research: CSU device lets you hear with your tongue Colorado State University How to roll your R's: The definitive guide How to roll your R's: The definitive guide Food: How spicy flavours trick your tongue How to Trill or Roll Your R's Bilingual Speechie Let's Talk About the d Sound! The d sound is a voiced postalveolar affricatethat simply means it starts like a stop sound d and releases into a fricative . You feel your