Mac volume through Carbon

[HeySchlitz]

This might be a feature request. I'd like to use the volume button to control the volume of the Mac when the output selected in the Sound system pref is Carbon. It shows a circle with a line through it and doesn't let you adjust the volume. Is there a way to do that now?

I currently have the headphone jack running from the Mac into a Dangerous Monitor ST Aux input as a workaround, but this would allow me to get rid of the monitor controller.

Edit to add: Having some way of controlling the volume of the Mac system sound vs. ProTools is what I'm looking to solve....system sounds are very loud, I have to adjust for volume from Music, YouTube, etc. Having a way to quickly do this or have it set softer in general would be great.