Make Submix Tracks available for Auto Ducking keyframes.

If Adobe would just add the ability to Side Chain a compressor this would solve so many of these issues. 

I came here to request exactly this! There are MANY situations where this would be very useful - today's one is this:

I have a couple of dialogue tracks, and I'm auditioning several music tracks. I have the music tracks outputted to a submix, where I'd like the ducking to happen, saving me doing the ducking on each of the (6 or so) music tracks.

I can't believe this hasn't been massively upvoted!

Another reason why this is a very necessary request. On many occasions an editor might use the music stems to reconfigure a music track for use in their edit. By using different stems at different levels they can effectively rebuild a music track and refine it for their use. If this music then needs to be dipped under a voice over it is annoying to have to keyframe each stem individually. What would be great is to send these stems to a music submix and then use ducking on this. Just one example on why this would be a great feature.

I know many don't use submixes but for those of us in the professional broadcast field Submixes are one fo the features that has Adobe way in front of the competition currently. It allows multitrack outputs in real time, and enhancing this would be of great value to the professional users.

YES!!!!!!!!