@X-Raym... In Track Inspector, you can customize the gradient png file in the theme. so yes. In HeDaMixer I still haven't done anything about theming yet. Give me time to make it work first
I have been fixing many small bugs today. I'm still having a bug in 1 pixel rounding issue in the meters... argghh...
For now you can change color after a reference level, but yes, after I do the theming options, it will be logical that it can use the same gradient for the meter as Track Inspector. I don't know if I would use it. I kind of like that the meter color inherits the track's color