However hereRoland says it’s compatible without needing extra power and users have reported that it works connected straight into the Apple adaptor as well. Just one thing to keep in mind with iPad compatibility is that the manual states that you need to connect it through a powered USB hub, presumably because it may use more power than IOS provides. There’s a small switch on the side labelled “COMP/TAB” that allows you to set it to use the supplied “old school” Windows/Mac drivers (“COMP”) or the more modern “Class Compliant” Mode (“TAB”) that doesn’t need drivers so it also works with IOS (iPad 2 and later, via Apple’s CCK/lightning connector), Linux and newer Android devices.
It has data indicators for its MIDI ports and has conveniently integrated USB and MIDI cables. The Roland UM-ONE mk2 is a compact and affordable USB MIDI interface that has low latency timing.