How to have a track fade in at a specific time during a timeline?

Okay that makes sense. Can I walk you through my thinking to see if I am understanding?

I currently have my project setup with 3 parameters that each correlate to a layer of my total track. Bringing one of these parameters (Pianos for example) to “1” takes the Pianos track from -infinity to 0 db, fading it in. Am I correct in thinking that I would need a command instrument for each of these different layers? Each command instrument would then require an additional parameter set as a “condition” maybe called “CanFadeInPianos” (for example) which would then be triggered by game code. Once triggered it would set my the Pianos parameters to 1? Seems like a lot of parameters and command instruments just to get this working, but maybe I am over complicating it. Is there a simpler way? Thanks for all your help, Joseph. I included a picture to show my current setup without adding additional conditions yet.