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The way I do it is record a snare hit first. I use the metronome by setting it to 1/8th, I hit the snare on the third hit. For example
1 2 SNARE 4 1 2 SNARE 4
After you have the snare recorded assign the loop to a pad and play it out. Not recording yet, just playing the pad over the snare and metronome and listening to how it fits. If the tempo is too fast slow the tempo down down, if too slow speed it up, do whatever you need to do. When you find a good fit simply record the loop with the drums. You could keep that snare or replace it with something else later.