I'm certain others have done this but for me, no. I'm working with PT 12 but thats not important, just that its a DAW. I've gone back and started working on a project from 2016 which was never anything more than ruff. MY wife Bonnie has 2 or 3 scratch vocal tracks on that project. So I have decided to re-do the 2016 project , which has always been on my to do list. it's Haggard tune. I re-tracked the entire tune with a fresh more simplistic approach, it didn't really take all that long to get the basic track down. But I needed the scratch vocal track and my wife was not available. AHHH.. IDEA ! I grabbed her vocal track from the previous project, layed it into the the new project, cut out what I didn't need and lo and behold , scratch vocal track is alive and well ! Now I can add my Guitar and Steel Guitar tracks to blend with the scratch vocal track, then she can come back later and sing again. Bonnie listened to the NEW ruff track and said, "when did I sing on this new track" ? I replied, you didn't, but you did sing 3 years ago ! Now I have done multiple E Sessions where folks have sent me stuff and I added it to a track or sent them a file track, this is basically the same thing except everything is already in house. It didn't even have to leave the PC ! Side note, the old track was over 4 min , way too long , the new track is just over 3 min. Just right. I wonder how many of us have incomplete projects sittin' around on a Hard Drive somewhere. There is hope ! I'll post the finished track when completed . It will be part of a 6 song CD that we are now putting into production.