I got the Tonal balance bundle, so along with Ozone 9 advanced, I also got Neutron 3 advanced and Nectar 3 Plus. or even just show the curve as a comparison reference while you program in your own EQ with other plugins. So if you wanted your vocal to match the frequency curve of a pro isolated vocal you found, or to match the EQ of your guitar to an isolated pro guitar part, you could save a snapshot of the isolated track to your library, then use Ozone 4 to match to it. I'd built a library of EQ curve snapshots from my favorite songs, and also of isolated tracks from commercial songs.

And then there's the frequency matching & morphing! Ozone 7 has this too, but Ozone 4 let you save snapshots of different songs / channels & reload the snapshots from a file later.

Sometimes that's exactly what you need to remove noise & keep the sparkle on a channel. The Multiband Dynamics in Ozone 4 includes a gate feature that isn't in 7, so you can eliminate specific frequency ranges below a certain threshold. Even though I have Ozone 7 and use it most of the time, I still use Ozone 4 for a few things, though usually on a channel rather than the master bus.

Ozone 9 plugin