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Despite it's name, this is actually a fully functional MIDI controller for Windows or Mac, and its USB connectivity makes it super easy to hook up and portable. When using it with an iPhone (4s or older), it has RCA connectors on the back to hook up external speakers, as well as batteries for portability, and pitch and mod wheels. 2 apps I recommend for use in iPhone mode with this synth are 50in1 Piano and the official SynthStation app. (P.S. The pitch and mod wheels work in USB mode too!)