Cells adds a number of additional features to Lattice:
A 3x4 grid of keys to select steps manually and play the sequencer more like an instrument.
Forward / Reverse mode controlled by a CV trigger and physical button.
Random step selection by CV trigger.
CV selection of the current step - great for inputting a positive envelope or LFO to cycle through the steps on the Lattice.
Gate output - Whenever a new step is navigated to, a pulse will be output by Cells in order to trigger a voice's envelope. Pressing on the keypad will also output a constant gate signal.