Launch FL Studio. Click "Channels" and hover the mouse over "Add One." Select "Audio Clip" to create a new audio channel.
Click "Plugin Database" in the left-hand sidebar. Click "Generators," "Drum" and "Drumloop slicer." Drag and drop the Slicex plug-in onto the audio channel.
Click the disk icon in the Slicex plug-in. Click "Load Sample." Navigate to the drum beat you want to cut up and double-click it. Slicex loads the drum beat and automatically slices it into its component drum sounds.
Click and drag the markers in the Slicex waveform display to fine-tune the slices so that each marked region contains only one drum sound. To add a new marker, click and drag a portion of the waveform to select it, click the "Region" icon and select "Add Marker." To delete a marker, right-click it and select "Delete."
Click the "Dump Score to Piano Roll" button, which looks like a series of squares arranged in a diagonal line. Click "View," then "Piano Roll" to open the MIDI piano roll sequencer.
Click and drag the drum slices in the piano roll editor to rearrange them. Click and drag the right-hand edge of a slice to lengthen or shorten it. To add a slice, click inside an empty square in the piano roll editor. Click "Play" to listen to the sliced drum beat.