Amazon.com: Lighting to MIDI Cable, 6.6FT USB Type B OTG Cable 2.0 iOS Devices Compatible with Select iPhone,Midi Controller, Electronic Music Instrument, Midi Keyboard, Recording Audio Interface, USB Microphone : Musical Instruments
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Arturia MINILAB MK2 USB MIDI Keyboard Controller 25 Keys Windows iOS White 4959112198296 | eBay
Vangoa Worlde MIDI Keyboard Controller 25 Keys
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Finale Blog: Using your iPad as a MIDI Controller - Finale
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