If you're ordering a PUC (not PUC+)....

This will work as well. You’ll also need the dingle to connect a usb to iPad.

http://www.amazon.com/Cable-Converter-Music-Keyboard-Studio/dp/B00D3QFHN8/ref=sr_1_9?ie=UTF8&qid=1460070295&sr=8-9&keywords=midi+cable