Would you want separate loudness control of the audio stems?

[49218]

So, imagine being able to listen to a movie soundtrack and change the balance between dialogue, effects and music.
You want the theatrical dynamic range? Leave at default.
You want to hear dialogues clearly without getting blasted off by abrupt loud passages? Turn effects and music down and leave dialogue as is.
You want an even greater dynamic range? Turn dialogue down.

The codec could be a simple 3x 32 bits per channel track with metadata for real time spatialization and upmixing from mono to as many speakers the user has.

Basically, it would end the need for studios to provide multiple mixes for each movie and finally put at rest the endless debate between people who want to listen loud and people who prefer to listen at lower levels.