Audio ducking features greyed out - not working

[#1]

Audio ducking is not working in a new project I am editing. Only the dialogue tag is working - the others are greyed out and I cannot select them. Any ideas? Screenshot attached.

[#2]

Audio ducking is not working in a new project I am editing. Only the dialogue tag is working - the others are greyed out and I cannot select them. Any ideas? Screenshot attached.

[#3]

What are you trying to duck, and what are you trying to duck it against please?

Normally, ducking is used to automatically drop the level of the score track when the dialogue track is meant to be audible. That said, you can also do this manually if needs be.

Can you please show project details, including all your audio tracks?