South Signal Lab CLOCK Tutorial: Creating Custom Grooves with the Groove Editor

This tutorial shows how to create, edit and use your own Custom Grooves in South Signal Lab CLOCK. Starting from an Independent Clock channel, I open the Groove Editor, shape individual step timing, save the result and apply it to the running clock. The Groove Editor turns microtiming into something you can work with visually and by ear. Instead of entering a list of timing values, each step is represented directly on the timing grid and can be moved ahead of or behind its nominal position while the groove is running. In this tutorial: • opening the Groove settings for an individual channel • entering the graphical Groove Editor • understanding the beat and step grid • selecting steps with TAP • fine timing adjustments with the encoder • coarse timing adjustments using TAP + encoder • changing the editor zoom with PLAY + encoder • using the long-press context menu • changing Custom Groove length • saving and activating a Custom Groove • adjusting Groove Amount and Rotate • auditioning changes while the clock is running • leaving an edited draft without accidentally overwriting the saved groove Custom Grooves use deterministic per-step microtiming. This is deliberately separate from Humanize: a groove describes a repeatable rhythmic timing pattern, while Humanize remains a stochastic timing layer. Production transparency CLOCK is still actively being developed, and features such as the Groove Editor continue to evolve. To keep tutorials accurate and make them practical to update when the software changes, the visual walkthrough is generated reproducibly from scripts driving CLOCK’s native simulator. Nothing shown in the tutorial is a fabricated interface or an approximation of the firmware. The simulator is part of the project’s development and testing environment and runs the actual application and rendering logic used by CLOCK. The narration uses synthetic speech based on a clone of my own voice. This allows the spoken tutorial to be regenerated alongside the visuals when functionality or documentation changes, rather than leaving outdated recordings attached to a moving software project. The firmware, simulator and the scripts used to generate these tutorials are available in the public GitHub repository, so both the implementation and the production process can be inspected directly: https://github.com/napolitano/eurorac... South Signal Lab CLOCK is a DIY-oriented, source-available Eurorack master clock, rhythm generator and gate sequencer.