How do I play a timeline from a timeline and then override its animation using some avatar mask?

I am trying to make a "conversation" timeline where one guy is sitting on a chair and chatting to himself. "Sitting" is a timeline that contains information such as where the chair is, how fast to play the animations, etc. I play it with Control Track and it plays fine. However, what I also need is to play some "chatting" animation as an override on top of the sitting animation. I tried to use Animation Override Track, but it does not work. The "sitting" timeline plays fine, but the "chatting" animation is ignored.

I assume it's because the "sitting" timeline is overriding any animations that the "conversation" timeline has. And if I put the "chatting" animation in the "sitting" timeline, then everything works great. However, I really need the "chatting" override animation to be in the "conversation" timeline. I need to be able to combine timelines in a master timeline and spice it up with various additional animations.

So what can I do? I am a beginner with playable graphs and I really don't understand how they are structured, but I assume that I could manually create an override animation playable and add it to the current top animation graph to make sure that it will play. Does this sound like a good idea? How would I do it?

 

Does not seem to work for me in play mode or otherwise. Here is my setup:


This is the master timeline.

This is secondary timeline (Test Timeline 2) that is being played by master timeline .
When I play this, the BardicheDialog1 is just getting ignored. However, if I setup something like this:

Then the BardicheDialog1 is being played fine.
This is all in play mode. What am I missing?