Hello, great job and congratulations on delivering the Exquis!
I’ve tested the Exquis with an MRCC MIDI Router Control Center with USB host. It is not working. It actually hangs the MRCC. One potential cause is that the Exquis seems to be sending MIDI clock before USB is enumerated. It would be a good idea to prevent anything from sending on USB until it has completed enumeration. This has been an issue with other brand USB MIDI hosts.
Contact Conductive Labs when you have some time to work on this. They can help debug the issue. https://conductivelabs.com/contact-us/