The reverse delay on the Particle, Raster, Tensor are different, but you can get similar results in a lot of cases.
The Particle chops the delay buffer into slices and plays each slice forward or reverse, with the probability set by the PARAM knob. WIth PARAM at 0 it is always reverse, with PARAM at 50% it will be reversed half the time, etc. You can synchronize the delay time and slice length (CHOP) to tap tempo or MIDI clock so that the reversed slices are a specific note length. It works well for rhythmic reverse - by setting the slice length to a note division - and also glitchy reverse with really short slices or only reversing occasionally.
The Tensor (in live mode) analyzes what you are playing and intelligently reverses it in real time. It tries to pick a length of sound to reverse that sounds natural and allows you to focus on your playing and not think about the reverse effect. Then, you can smoothly go from reverse to stop to forward. In NXT (next or dual buffer) mode, you can tell it the exact length of sound to reverse. For example, you can alternate between buffers that are one measure long, and as you play into one buffer the previous buffer is played back in reverse. In both modes, you can use the RAND knob to occasionally flip the direction, but the Tensor makes the decisions based on what you are playing.
The Raster is a classic reverse delay, with some tricks to minimize glitching. The delay time can be synchronized to tap tempo or MIDI clock.