What is it?

PCBs and Panel for a Eurorack Serge Style Matrix Programmer / Sequencer: The Voxmachina Leo Leo Matrix Programmer. 42HP 33mm deep.

Analog matrix sequencer based on Serge's Programmer from the 70s, here added more complex functionality that can be used as 4x4 cv channels, 2x8 or even 2x16 cv channels, plus also the ability to cascade through the front panel switch to activate it (connects to another with a 10pin cable through the back panel), also adds total control over each stage in both directions (skip, stop, active and mute), operates under three different clock inputs: Left, Right and Down can be used from a precise sequencer to a generative and random mode as well with manual button triggers for each step.

https://modulargrid.net/e/voxmachina-leo-leo-the-matrix-programmer

Why did you make it?

I wanted to make one for myself and I have leftover PCBs and a panel. It's a super fun module!

This contains 1 FR4 (PCB material) panel, and 2 PCBs. No components are included.

BOM available here: https://github.com/musicdevghost/eurorack/tree/main/LEO%20LEO%20-%20MATRIX%20STAGE%20PROGRAMMER (NB you will need thockiconn jacks and 2 extra 1N4148 diodes as I added them to fix some issues)

There's no particularly difficult to find parts, just a lot of them. Soldering is pretty easy, everything is through hole, but there are many components to add.

What makes it special?

I modified the design slightly to fix an issue with the DCBA output and some resetting issues (see my PR here: https://github.com/musicdevghost/eurorack/pull/18 ). I also changed the jacks to thockiconn ones as they were what I had around.