When you download a loop, usually you know the BPM. If not, it's usually an exact number of measures, and is easy to fit to your project's BPM. Most of the time, it's no trouble to fit a loop into a project with a different tempo.
Sometimes, however, you might run across a situation where you don't have a neat, 1-bar sample, and you're not sure what the BPM is, either. In this case, you need to match the BPM by hand. Here's one method to get that done:







