Thnks for all the suggestions. The powered usb hub was a good next step to find the solution. i found one, without the power supply, but i wanted to test it anyway, and then it gave me a suprising result. I connected the hub to the GSI, and the hubs led went on. I connected the oxygen to the hub, power on and no midi. Then i connected the irig keys also to the hub, that one worked power and midi.......and now the the oxygen also send midi to the Gemini. Looks like the irig gave it a jumpstart. I disconnected the irig, the oxygen still worked. I shut down the Gemini and powered it up without the irig attached, and the oxygen did not send midi... until i attached the irig again. So it gets enough power to potentialy work, but the 2 dont seem to like each other i think.