Which will be prioritized when I input synchronized signals to all USB and MIDI IN terminals?

Clock source set in [Sync Source] of the [MIDI IN Settings] category in the Settings menu will be prioritized.
For details, please see the [MIDI IN Settings] in the Settings menu in the Instruction Manual of this product.

You can download the Instruction Manual from our support page<https://www.ーーー（TBD）>.