The subzero box has a mode setting that sets the various through settings best leave it on boot default. If you a want to send keyboard into mu10 use input device record in the DAWand select the KORG. Switching items on and off or unplugging can confuse things. Probably best to turn on subzero first then turn on other devices. Don’t forget you can bypass the xg Editor by pressing

this may or may not be correct but you can press the button and different things will then operate differently