So this device works well with USB devices if you consider a few things: * USB devices use a lot of power. and will not work reliably. If you have a hub between the adapter and the device it might work as it will collide with it. * Powered USB hub works well with USB devices. * Only iOS supported devices will work. What I've tried: * Blue Yeti USB microphone. Worked great with the adapter. * transcend USB3 memory card reader: did not work directly. Does it work with a hub (powered and unpowered) * The 1/4" to USB guitar adapter worked direct and worked well with Garageband. * USB flash drives: Most didn't work direct, all worked with a hub. This was the one used with an iPad Pro 9.7" and iPad mini.
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