How to cut of power to usb-c in sleep mode

Hi everybody

I own a new MacBook Pro 15" 2016. Since I have several external USB devices (sound card, Maschine music controller etc) I attached a USB-C to USB hub on one USB-C port at the Mac. One other USB-C Port at the Mac is used for power supply.

Now, I want to cut off the USB-C power for the external devices when I send the Mac to sleep, so that the external devices do not consume energy. Is there a way to do so? Actually, the stay powered.

I run Sierra, 10.12.14

Thanks