Help remixing tunes tracked without a metronome

[Dmerricka]

Hi, I'm remixing my friends demo with additional stuff including rythem. They tracked with out a click track. I hat trying to beat match stuff. I'd like to trigger some drums off their drum tracks. Guise I'd use something like drumagog for that. What do you all do? I'm fine with the rythem being natural none metronomed but would love to strip out a grid so to speak. I will be using abelton live and mechaine to do this with prehaps using machine in stand alone for this on a pc. Any advise would be wonderful.