Signal Deluxes Skyline Frontier is the narwhal of animal crackers. With a swimming sharpness, it's a zoo of crunchy, prowling sounds that quicken the feet as well as the mind. The Mexican duo serves up confetti flavors that delight right out the box. Like a Jenga of froyo toppings, Signal Deluxe's Ghetto Weed is a textural wonder. Brassy squelches and cocky kick drums usher an edible parade of aural stimulation. Not for small appetites.