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I'm currently building a new midi controller using 16 illuminated arcade buttons and a brain version 1 from an old controller. I'm not interested in LED feedback, I just want the buttons to be lit as long as the controller is powered by usb. Is there a way to grab some power from somewhere on the board? On my old controller I used a separate power source to light them as they were 12v LEDs and there's only room for 14 LEDs on the matrix but I'd rather just have everything powered by usb. The LEDs I'm using now are 5v so I'm guessing the board can power them.