Recycle is famous because it's about the best application on the market for splitting up beats. It breaks up a sample based on the highest energy transient points (e.g. drums and hi-hats).
Using it is a piece of piss. You get you loop of say 2 bars of old hip-hop break. Import it into Recycle, adjust the sensitivity meter to the point where it splits the break up into usful bits (individual drum hits or other usable parts). You can then save these parts as individual sample files (wavs etc) and output a MIDI file which correlates to the samples. When put back together in a sampler and sequencer you can press keys in sequence and the break will play back as recorded, but if you want to make a DnB track out of it you just play the notes until you hear something you like.
All the commands are obvious and covered in the manual and on-line help.
If you have a specific question then let me know at
neil_chambers@paragon-it.com