When working with loops, ProTools makes it easy to loop a region. There are two methods. My favorite is to simply highlight the clip I want to loop and click Command + D (Edit Menu > Duplicate) as many times as I want the region to loop.
You can also click Command + Option + L to open the Clip Looping window (Clip Menu > Loop) and use the Clip Looping window to loop the clip as desired.
Both methods work well when looping forward, that is adding loops following the original clip. But what if you want to add a loop backwards, that is add a loop before the original clip? Luckily there’s a key combination that makes this possible.
Hold down Control + Command + Option and then click on the clip you want to loop backwards. It’ll work just like Duplicate (Command + D), except the new clip will appear in front of the one you’re looping.
If you have any questions, feel free to contact me, or add a comment.