The YPG-635 is an older unit that is not an iOS (iPad, MINI, iPhone) compatible device. In order for a device to be compatible, it must be able to work with the software "drivers" that are built-in to the iOS operating system, and the YPG-635 can not do that. However, you can connect it to a PC or laptop or MAC by downloading and installing the latest special drivers from the Yamaha Support site:
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