Bjorn Akesson tutorial question?

Bjorn Akesson video series,?

See on the pad video were he sets the master volume to zero on (Nexus) Then he goes to some other mixer chanel strip (I don’t know what its is) He sets that to zero then he brings back up the nexus volume. This is gain staging i think? If it is what is the best way to do this in Ableton and should I do this with every single sound? Make every individual sound the same level?

Thanks Poddy