Step 1: Listen to the song.
Step 2: Now hit play on multiple windows at the same time. Try and make the vocals go off beat. No matter when you hit play they always seem to just layer one another. You can get it to go off beat, but it's tricky. Yes, the handclaps can get wonky, but the vocals tend to stay pretty much smooth. Also, it sounds really great when you play multiple versions at once because the synths and the vocals sound BIG!