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midi keyboard doesnt take power from powered hub

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Recently acquired this new setup. As the rMBP has only 2 usb ports, I got a transcend usb hub. It is a powered hub. i.e external power. The adapter for the usb hub says it can deliver 12V/1.5A. The launchkey has 9V/100mA written next to the adaptor jack. So that means the usb hub should be technically able to power the midi keyboard right? But it doesnt turn on when plugged to the hub. It does however power on when plugged straight to the usb port on the macbook. Does anyone here have a similar setup? Should i try to get anothe usb hub perhaps?
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