Does anyone know how the MX-1 digital port works when you configure it as an output?

Does it matter in which mode the MX-1 is? (Mixer/External mode)

I guess in External mode, you can choose what to send to it from your DAW? But do the fader and channel filter/fx have any effect still?

I’m thinking of using the Digital output to send audio to my USAMO, which will convert it to sample accurate midi notes that’s routed to my TR-8S, but I’m not sure it will work that way?