You need focus on the "output" device. That's what matters, and has to do with the usb dac, as you're concerned with here. Forget about all the input stuff - doesn't apply. A usb dac is an output device.
When you make a selection in the MIDI screen, the screen changes for selection of the settings for that device selected. The Benchmark in this case.
Basically, when you plug in a usb device, such as a usb dac, it reports what it is capable of doing, e.g., 16 or 24 bit, or, 44.1 or 96 kHz. This then populates the selection found for that output device in the MIDI screen, that you may then select from.
In other words, what you see there is what you're capable of doing.
No mine field, pretty simple.
When you make a selection in the MIDI screen, the screen changes for selection of the settings for that device selected. The Benchmark in this case.
Basically, when you plug in a usb device, such as a usb dac, it reports what it is capable of doing, e.g., 16 or 24 bit, or, 44.1 or 96 kHz. This then populates the selection found for that output device in the MIDI screen, that you may then select from.
In other words, what you see there is what you're capable of doing.
No mine field, pretty simple.