Can someone tell me how to fade "all" of my tracks simultaneously?

I've rendered my mix then started a new project to add mastering plugins. But, that was because the computer I use to use was a little weak. I've had the one I currently use for a good year now, but I've never changed my technique. I guess there is no reason I shouldn't save a few minutes of time by doing it all on the same project. And...yeah....someone did tell me how to do this once, but I can't remember. sigh. Thanks in advance again.

1. right click on the tcp and "show master track" Put a volume envelope on the master track and put the volume points at the end of the tracks.. add some points going down ...

Thanks....that's not it though. There's an easier way. Basically like fading a regular track. I think anyway.

I think maybe it was "Select All Tracks"...then just fading them. Thanks for your idea though.

....or, you could just send the channels you want grouped together to a Buss and automate that, if there were other tracks in your project you didn't want to control that way.

I appreciate all the ideas guys. Thanks.