Listen to Low-Pitched, Descending, Metallic Droning Hum online. Low-Pitched, Descending, Metallic Droning Hum is an English language song and is sung by The Hollywood Edge Sound Effects Library. Low-Pitched, Descending, Metallic Droning Hum, from the album Cartoon Trax Sound Effects, Vol. 5, was released in the year 2015. The duration of the song is 0:11. Download English songs online from JioSaavn.