supertux/data/images/objects/radio/radio.sprite

(supertux-sprite
 (action
  (name "quiet")
  (hitbox 0 0 0 0)
  (images "radio1.png"))
 (action
  (name "loud")
  (hitbox 0 0 0 0)
  (images "radio1.png"
   "radio2.png"
   "radio3.png")
  )
)