The easiest way to start with messing with beats is to take an 8-count loop (count 1..2..3..4..5..6..7..8.. ) and cut it into four even part, placing cues on the 1, 3, 5 and 7 beats - we’ll call the cues A, B, C and D.
You will be triggering the cues so that they play the entire loop starting from their cue point when you hit the key, not just while you are holding down the key. This makes things easier to start with.
Begin by recreating the rhythm by pressing the keys in order at a regular tempo. Keep going until you get the groove of the break and it sounds like the original: A..B..C..D.. A..B..C..D..
Next, keep going but try repeating a cue: A..A..C..D.. A..A..C..D..
Then try reordering the cues: A..C..B..D.. A..C..B..D..
Try triggering the cues at double tempo: AABBCCDD AABBCCDD
Try triggering only one of cues at double tempo: A..C..BBD.. A..C..BBD..
Now you get to go crazy and make up your own breakbeats!
A..CBCBD.. / ADC..C..A.. / BBCB..DD / DDA..CBA..
The next step is to choose cue points that are not regularly spaced inside your loop, so you cue the sample on a particular instrument, e.g. a Snare you like, a particular bassdrum or hihat pattern. This makes recreating the original pattern a little more challenging, but your cutup breaks can really catch a groove.
Now you’re using your controller as a musical instrument - don’t expect to get it right first time. You will mess up plenty, we all do. Just practice, practice, practice!