New Feature Request
Toneboosters EQ Pro allows you to see the EQ curve in the mixer the same way that ProEQ (stock EQ) does, the extension just needs to be implemented. I'm sure others EQs also allow this, it would be a great feature and addition to Studio One. Reaper and ProTools both have this feature.
Here is what Toneboosters wrote to me:
Yes TB Equalizer Pro supports the Reaper VST extensions to show the EQ curve in the mixer or DAW track panel. It also supports AAX mixer extensions to show the curve in Pro Tools, and in AAX-compatible hardware controllers.
For other hosts it will depend if the host has implemented support for these Reaper VST extensions as well. As far as we're aware, Studio One doesn't support them (yet) but to be sure it's best to ask the devs. If they haven't supported it yet, you can add a feature request - would be great if they would implement it. It's quite easy actually.