Matrix Programmer / Sequencer

Leo Leo was born out of inspiration from the original and first Serge Programmer from the 70s, which consisted of four individual stages of a control voltage that you could also trigger independently, very much like the Buchla Sequential Voltage Source.
This module extends this principle by adding more functionality and possibilities; at its core, it consists of those same four independent control voltage channels, now extended to form a matrix of control voltages.

For each stage row (A, B, C, and D), you’ll have a dedicated control voltage output in the section “ROW CV OUT” (0 to ~10v), an independent stage trigger input on “STAGE TRIGGER” and also an independent stage gate output in the “GATE OUT” section. There are two particular gate outputs, “ALL” which outputs on every stage change, except if it’s muted, and “COMMON” which outputs on either stage change or stage trigger event. You can also as well mute
individual stages and also manually trigger them individually on the “MANUAL STAGE TRIGGER” button section.

There are additional control voltage outputs named “ABCD” and “DCBA”; together with the vertical clock input “DOWN” and the vertical clock reset input “RESET”, you can have 4x4, 2x8, and even 2x16 step sequences! At the same time that the control voltage is outputting at the “ABCD” output, the inverse sequence is outputting simultaneously at the “DCBA” output. With the vertical clock input “RESET” you can also separate them by resetting every vertical clock divided by two, conveniently also provided in the output “/2” so you can self-patch it into the reset input. Automatically you have two separate 8-step sequences while simultaneously, you still have the four individual CVs and gate outputs to play with.

The module has three clock inputs, “LEFT”, “RIGHT” and “DOWN” each one operating independently from the other, which means you can have three clocks pinging simultaneously and create infinite variations of a sequence.

You’ll notice a lot of mechanical switches on the module, which make it highly playful, the four switches below each stage are to either mute or unmute a stage; if a stage is muted, the gate output in “ALL” will be muted, as well.

All files including BOM and build instructions:
https://github.com/musicdevghost/eurorack/tree/main/LEO%20LEO%20-%20MATRIX%20STAGE%20PROGRAMMER

Assembled Modules available here:
https://www.siammodular.com/voxmachina-leo-leo-matrix-sequencer-pcb-kit-or-pre-built

https://www.siammodular.com/voxmachina-leo-leo-matrix-sequencer-pcb-kit-or-pre-built

• 40 mA +12V
• 20 mA -12V
• ? mA 5V
• 33 mm Depth

Available as an assembled Module and as a DIY project.

This Module is currently available.