The SEQ XL is a modern incarnation of Serge's analog sequencer / programmer. 8 stages. 2 rows of CV output. A - B (A minus B) outouts the difference between A and B (-5 to 5V range). The length of sequences can be set via the pushbuttons - while a sequence is running. RESET, UP/DOWN, HOLD inputs. Switch to start / stop the sequencer. PULSE STAGE SELECT inputs allow selecting specific stages. great at audio rates. ALL GATE output goes high when any button is pressed (or a stage is selected by a pulse input) and allows the use of the SEQ8 as a simple mini-keyboard.