Sync Tempo with Audio Tracks

[xb2003]

I'm using Logic Pro X. I have some songs that were live performances multi tracked with an XR18 as we were performing. Im trying without success to sync the tempo up with the audio (I understand it won't be perfect) to do some rhythmic delays. Whenever I changed the Tempo it just moves the audio with it. Is there a way I can make them operate independent of each other so I can try and adjust the tempo to a point that it fits the audio?

Thanks

 

[bouldersoundguy]

Usually I just manually set the delay time rather than trying to sync it to an external tempo or set the tempo on a song that wasn't recorded to a click track. I hope that makes sense in the context of Logic Pro.

 

[mixsit]

In Sonar you would be extracting a tempo map from the audio.
Never used it, but from what I've read not as easy as they make it sound. Perhaps Logic has similar.
https://www.cakewalk.com/Documentation?product=SONAR X2&language=3&help=AudioSnap.06.html

 

[threeheavens]

So you thought living off the grid would be easy


https://youtu.be/4Wo5JVTpRZc

you could also try automating the rate on your delay (writing the movements you make).