UR28M volume control of digital output

Is there a way to control the volume of the spdif output?
Can we control the volume faders of the dspMixFx-software via MIDI?

i think the spdif is only streaming data, so to control the volume use can just use the fader on your daw tracks that assign whatever the assigned spdif output is…
and btw, isn’t it more simpler to control dspMixFx directly from the interface panel itself?