jinkl : the echo sound is not those compressor surge i guess. cus lastime wen i tried using it it is not ari sound but those bell sound after the chew chew sound. im toking bout type-s now. first sound is chew den followed by kring (bell) sound. the echo sound yes i know bout it, it is like sum air released after the bov sound, but for type-s it is not air sound. correct me if im wrong