Modular Synth Logic Logger
Hardware synth patches are famously ephemeral. Once you pull the cables, that sound is gone forever. Welcome to your digital logbook for analog and modular magic. Document your signal chain, control voltage routings, and precise knob values before you tear down the patch.
Patch Builder
The Art of Patch Logging
Every modular synthesist knows the pain of creating the perfect sound, recording a track, and then trying to recreate it a week later after the patch bay has been cleared. While the ephemeral nature of Eurorack and modular systems is part of their charm, the inability to reliably reproduce a specific kick drum, generative sequence, or evolving drone can be deeply frustrating for serious audio engineers and music producers.
Documenting a patch manually requires a structured approach. It is not just about writing down "VCO to VCF". You need to track the exact knob positions, the tuning ratios between oscillators, the envelope stages (Attack, Decay, Sustain, Release), and deeply complex feedback loops. More importantly, understanding the difference between your audio path and your modulation paths is crucial to diagnosing why a saved patch doesn't sound quite right when rebuilt.
Using a standardized naming convention and clear signal flow arrows (->) ensures that your patch notes are readable months or years down the line, regardless of whether you have swapped out specific modules for newer versions.
Understanding Signal Types in Your Logs
When using PatchSketch to build your notes, we recommend distinguishing between different signal categories to keep your documentation pristine. A standard Eurorack or 5U system utilizes several fundamentally different types of electrical signals.
Audio Signals: These are the actual sound waves oscillating usually between 20Hz and 20kHz. Oscillators (VCOs), noise generators, and sometimes fast LFOs create these. When logging, trace these from their origin through filters and VCAs to your output module.
Control Voltage (CV): CV is the lifeblood of modular synthesis. It is used to modulate parameters over time. Pitch CV dictates the frequency of an oscillator, while modulation CV might sweep a filter cutoff. Always note the source of the CV (like an LFO or envelope) and its destination.
Gates and Triggers: These binary pulses tell modules when an event has started. A trigger is a very short burst of voltage used to reset clocks or ping low-pass gates. A gate stays high for a duration, telling an envelope generator how long a key is being held down. Documenting your trigger logic is essential for complex generative rhythms.