Question:
Have you found the master channel by now and do you know what’s it all about?
You won’t find anything if the answer is no, that’s for sure.
If the answer is yes, then put your cursor into the master channel and activate the automation button.
Then you’ll find what you’re looking for. If you don’t know where to find the automation button, here it is:
It’s on the lower left side of the DAW, right next to the track DSP panel. I’ve marked it in red for you.