I tried to connect my korg nanokontrol2 to pa700 and didn't have success

It hasn't (pa700) USB powered .
On pa1000 all work ok in front and back USB ports , on pa700 not ....
Can anyone confirm that ?
Thanks .
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... hard to believe, if one relies on manual of the Pa700:showwhite wrote:.. for Pa700, you need a usb hub to make the usb midi work ..