iPad -> FC-3 -> Valeton GP-100

Hi, I have set my FC-3 to send Midi commands to my GP-100. It works correctly but I woul'd like to send others midi commands from my iPad to the GP-100 also. I tried like this : iPad -> FC-3 USB device and FC-3 USB host -> GP-100 The iPad Midi message isn't transfered to the GP-100. Is there a working solution ?