WARBL doesn't make any sound on its own, so you'll need to plug it in to a MIDI host device. This is very easy, because most portable devices (and desktops) support MIDI, and there are lots of free or inexpensive MIDI apps. Some suggestions for apps include Appcordions Celtic Sounds
, Universal Piper
, and Roland Sound Canvas
. Connecting WARBL to an iOS device also requires the Apple Camera Connection kit or equivalent adapter that converts USB to Lightning plug.