Repository contains a complete open-source guitar-pedal product line: custom KiCad PCB and enclosure hardware for the Electrosmith Daisy Seed (125B, 1590B, and 1590B-SMD variants) plus the matching bare-metal C++ firmware that runs on the STM32H750. The firmware is the dominant software artifact: a modular, block-based audio effects platform with 40+ loadable DSP modules (drive, delays, reverbs, modulation, granular, spectral, tuner, looper, drum/synth voices, NAM neural amp model, IR cab loader), a menu-driven OLED UI, MIDI CC/note support, footswitch control, and persistent effect presets. The architecture is a compile-time composition rather than a runtime plugin system. A BaseEffectModule interface and EffectChain allow serial effects per hardware variant, selected through loaded_effects.h and Makefile target flags. GuitarPedal.cpp drives the real-time audio callback, control monitoring, MIDI dispatch, and autosave. Hardware variants are abstracted by BaseHardwareModule subclasses that define pin maps, LEDs, true-bypass switching, and display wiring. Heavy DSP state (delay lines, FFT buffers) is placed in SDRAM/DTCM via global DSY_SDRAM_BSS blocks, which gives low latency but severely limits how many effect instances can be active. Overall quality is good for an embedded audio project: the effect-module pattern is consistent, several components (NAM A2 inference, Dattorro reverb, persistent-store layout migration, tape-flutter modulation) are genuinely reusable, and CI builds all variants. The codebase carries real maintenance debt: hardcoded sample-rate assumptions, global-buffer single-instance effects, commented-out experiments, duplicated hardware modules, and patched copies of upstream DSP headers. It is actively maintained but not a polished library; reuse is best done by extracting individual effect or utility headers rather than adopting the project wholesale.