I just discovered something rather wonderful on my QU-24. I can copy / paste <Copy><Ch#> / <Paste><Ch#> between scenes. This means that I can record a concert to QU-Drive, play it back, adjust Eq, save this as a scene called Playback. I then <Copy><Ch#> any one channel, load a new scene for the next concert and <Paste><Ch#> into it. I save this scene too after each channel. Now I can tweak all my channel settings in my home studio and optimise the Eq, reverbs, etc. and save them, one at a time to my concert scene. Doing this means I do not have to mess up my entire concert scene or mess with my input sources.
I am sure many people knew this but when I tried it, because I needed it, I was most pleased.