I wasn’t thinking of sidechain compression, but a simple way to control the “relative” level of a track over time… but still have the master volume controlled by the mixer slider… if that makes sense.
In Reaper, if you for example have a track and you’ve set the volume slider to -4db. Then when you enable a volume envelope the slider will snap back to sit at 0db, and the envelope will be created with a -4db across the entire track.
But that’s not the way I’m thinking of what I want to achieve with the envelope. Perhaps I enabled it simply to reduce the volume by 1db when there is a solo… regardless of what I set the overall track volume to. So in my head it would make a lot more sense if the slider stayed at -4db and an envelope was shown, sitting at 0db across the entire track. Then I could easily duck the volume where needed, and see how much I’ve lowered/raised it with that move… rather than always seeing the final track volume on the envelope…