Due to the delay on the analog Line-In, Sonos is not a solution for any live performances.  You could use the low latency digital input on the Sonos soundbars, however the input on that will also be delayed when you group it with other speakers, so the usage is limited.

Thank you for your answer. Is there no software that makes it possible to switch between two players? Like you had two players in sonos that could Play simultanuasly and with a volume controll for each channel ? 

None that we are aware of. There have been many folks over the years that have wanted to use Sonos speakers, due to the quality of the devices, but as @jgatie mentions, there isn’t a way to overcome the design of the nature of the software. 

Not really sure what you are asking here, but the bottom line is Sonos is not fit for any live performance purposes, including live DJ’ing.