While the Simpler now offers pad slicing, you still can't record into it, but need to drop samples in. This is where SlicR by Benjamin Van Esser comes in. It's a simple slicing device, great for some quick and dirty slicing. It's supposed to be used in conjunction with the included SendSlicR~ device. The device enables performers to play slices of live recorded audio (or pre-recorded samples) on the fly.
The SlicR device needs to be added to a MIDI track and a SendSlicR~ device on an audio track. SendSlicR~ will route the audio output of the track it's on to the SlicR instrument device. SlicR uses 10 buffers which gives you a maximum polyphony of 10 voices. All parameters are MIDI mappable so it is also useful for live performances.