The SQP Sequencer M-odule

Review by Hexenduction

Invisible Hands

The SQP Sequencer is a great M-odule. Once you’ve covered your sound generation needs with a Creature and additional M-Class panel, you might want to consider picking up an SQP Sequencer. I would argue that after a filter, a sequencer is the most important part of any synthesis set-up. It can create rhythmic patterns and melodies, act as a modulation source, change amplitude, produce unique waveforms and control parameters like panning, triggering and clocking. Sequencers are like the invisible hands that perform all the utility operations we don’t want to.

Bacon Bits

Invisible hands are great, but what if those hands also had a brain with ulterior motives and possible hemorrhaging? This is where the “P” comes into the equation: programmer. The SQP can be patch programmed to create very radical and sometimes erratic sequences. So instead of getting Kevin Bacon in a bad remake of The Invisible Man controlling your synthesizer, you get Francis Bacon manhandling your controls and taking your sound into twisted new realms.


The true power of the SQP Sequencer comes from the litany of inputs you’re provided that allow your sequencer to become self aware. The STAGE SELECT inputs are the bread and butter of the panel. Simply patch a pulse into the stage you want triggered and as the sequence progresses this stage will become the priority. With a variety of pulses selecting the different stages you can come up with some very abstract and odd sequencing. The UP/DOWN input makes the sequence ping pong back and forth, creating even more variation. The HOLD input will pause the cat and mouse game when the input voltage goes high. RESET will bring you back to start and PRESET will jump to the stage you select via push button. If you’re interested in creating shorter sequences, just take the GATE OUT from the stage after your final step and patch it to RESET.


The outputs on the SQP are also worth mentioning. Each stage has a dedicated GATE OUT and there is even an ALL GATE out for sending a pulse for every step. This is handy when coupled with an additional sequencer or pulse divider(PDIV). There are also the A, B, C and D outputs that are 0 – 3.5v outputs controlled by the rotary pots. This is obviously where you would patch from to control the pitch of your oscillators/filter frequency or the range of your VCA and XFAD panning. The AB output is the voltage difference between the A and B rows. The SQP gives you 1 to 6 stages or steps to work with per each row.*

Apollo 13

*There is the possibility of combining 2 rows to make a 12 stage sequence but it involves the use of an Active Processor and a Pulse Divider. I haven’t had the chance to try this out yet because my system is lacking an Active Processor, but in theory here is the patch:

Row A to Active Proc IN 1 and Row B to IN 2.


PDIV /8 OUT to Active Proc VC IN

Active Proc OUT to final destination.

(Thanks to Cebec for this patch explanation!)

UPDATE: From Cebec -
A note on that patch for creating a longer sequence out of two rows: the PDIV /8 output will only work when using a 4-Stage SQP. If you want to combine two rows of a 6-Stage SQP you’ll probably have to use two PDIVs to get the right divisor.

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Serge Modular Shop Panels and M-odules (including the "SQP Sequencer" M-odule) are currently manufactured by Sound Transform Systems (262) 367-3030.

What you give is what you get.

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