This short walkthrough from Ableton's Learn Live series shows how to use the "Warp as 1 Bar" function in Simpler to lock a tempo-mismatched recording to your Live Set. The process is straightforward: drag the recorded clip into Simpler, set your start and end points, then click "Warp as 1 Bar" and the sample snaps to your project tempo.
Once warped, the loop plays back in sync from any MIDI key, and you can pitch the material up or down across the keyboard, which opens up creative reuse of recorded loops beyond their original key.