What is tghe best way to compare sound against sound in Cubase 11

[ZeroZero]

So, could you enlarge about how to use pink noise in relation to flutes? At the moment I have no clue.
I am also watching this video about Cubase and the Loudness . Its really informative in a geeky way:

Monitor Your Audio's Loudness | Advanced Features in Cubase Pro 8