This workaround also works in my issue: iPad USB sound routing issue
Workaround = 1. Connect first HDMI. 2. Then select [Output to iPad Speaker]. 3. and then connect the Reloop buddy controller. With this order the video outpot works on hdmi and the audio output works in the reloop controller.
Definitely this is a BUG, because the selector of the audio output on the settings not works when 2 external aoutputs are connected (in this case HDMI and Reloop buddy). Just works with this trick.
I wish you resolve this soon.
Thanks,
Marc