Little Recordnigs got it pretty right, but you have to make sure that all of you are playing with the same BPM. In every DAW is a clock that you can set to whatever BPM you want. When recording, the clock, as a defautl setting, will tick 4 times, one bar, and then the recording starts. After that, make that all rendered tracks have the same starting point. It´s tough to work with a track that starts 25 seconds into the track so make sure you render everything from 0 seconds, so all tracks have the same length. Here' an example, the tracks are from a song I#ve been working on, uploaded them to Audacity real quick to show you what I mean: