"When I played in a band, we had to work with the club’s sound engineer or bring our own to get a balanced sound setup before the audience showed up. The more recent gigs showcased an interesting technology, a system that generated pink noise through the actual sound system, from the original sound sources before the mixing board, all the way through power amplifiers to the speakers at front of house. The engineer put a reference microphone in a strategic position, turned on the pink noise generator, and twiddled equalizer knobs to get a roughly even spectrograph (plus unavoidable “sound-guy magic” to de-equalize somewhat for specific gig purposes like dancing or seated listening) for the whole room, using the actual speakers and sound-reinforcement equipment we would be using."
For stage shows, having a proper computer driven sound system with a large array of small transducers would let you do stuff like having the audio follow the position of the instruments and voice accurately, as well as doing some really silly things, like rotating 3d soundfields. It takes some reasonably serious hardware and knowhow though. A good starting point is here - http://www.york.ac.uk/inst/mustech/3d_audio/ambis2.htm
edit - that Behringer thing sounds really cool though, makes me wonder how hard it would be to code something like that in pure data or similar. https://puredata.info/