Listen to the sound clip Grunting 2 from Knuckles Sounds: Sonic Adventure: Grunting 2 Grunting 2 This sound is from Knuckles Sounds: Sonic Adventure Soundboard for Knuckles The Echidna, with audio from Sonic Adventure. Contains over 170 sounds including anger, threats, and more. Go to the full soundboardwith more sound clips Search