to be able to play back previously recorded takes you will need to fully integrate SLP with Pro Tools. There are different options depending on your existing studio setup. Please have a quick look at paragraph 7.2 of our quick start guide which explains the most important options.
If you are on macOS you can also check our setup guides on YouTube: SessionLinkPRO channel
The videos are currently only available with German voice over but we offer english subtitles. We are working on an english version!
I hope that gets you started. Come back to us if you need further assistance. In that case, please provide a little more information on your setup (e.g. operating system, audio interface(s), how does the current routing look like).
Tim | SessionLinkPRO