[sharing is fun] Very basic audio control bar...
I don't intend to do any further work on this myself as it does everything I want it too but I thought other people may be able to use it as a starting point for other ideas. It was based on an idea I saw someone else do on here a while back but I couldn't find it.
This requires Andrew Pask's draggable JS (https://cycling74.com/story/2006/5/15/15027/4227) saved as draggable.js in the search path.
Max Patch
Copy patch and select New From Clipboard in Max.