So here’s an old post with brief description of my setup. Note I’m using Control room so Mix 1 is my Mains and Mix 2 is my headphones - but the same principle applies. The full thread has a few links to youtube videos which may have more details. I thought I had an old post with actual pictures describing the full configuration. This question gets asked quite a bit so you may find some more youtubes and posts on the topic. Anything UR44 (not C) will apply to your device.