I would not recommend an unpowered hub to be used on any keyboard as it is very easy to overload the USB Port.

If you must go for one, then go for a 2 port USB 2 hub as this will reduce the chance of overload.

Hope this helps

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).