Seconded-- I don’t run monitoring like @The_Elf, but I run all the mains and inputs through it while using it an interface. I have a couple of scenes setup for whether we’re in a venue with a sound crew, in which case I just run it as an audio interface and send it up to FOH, or some venues we play with a totally crap house sound where we rely on the XR18 entirely. I walk up to the existing board, unplug the mains and plug them into the XR18, and all our sound is ready to roll. No latency issues have ever come up.