Is this device “stackable” in case i discover I need more inputs/ outputs?
Yes and no.
It’s scalable with adat inputs.
So you’ll loose dsp capabilities of the the adat connected units. But you’ll be able to apply dsp fx from the usb connected one. The trick is to connect the UR824 with usb once, do your routings, then connect it in slave ADAT mode.
Is the integrated cue system and overall integration with Nuendo good?
Yes very good. It is in the console, you get a dedicated hardware strip.
Only drawback I found using it in long voice over sessions : You loose contact with the talent while loading the next session.
So I ended up doing the famous “fake UR824 fake dll trick”, so I could work with the UR824 with the dedicated mixer (hence no integration with the nuendo mixer) for those sessions.
Usually, you keep on talking to the talent about the next session while loading the incoming project.
Is the zero latency a reality?
Yes, everyting PRE nuendo recording is 0 latency So guitar amp emulation, reverb, eq etc…