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memlnaut-nisps/MAP.md
monkey-w1n5t0n a77770f95d feat: curve truth, DriverConfig, real telemetry, engine benchmark 
Four items from one workflow, committed together because their build and CI
wiring genuinely interleaves — nisps/CMakeLists.txt, run-all-tests.sh and
ci.yml each carry hunks from two of them, and the stage renumbering (1/5 ->
1/6) touches every line. Splitting would produce commits that do not build,
which is worse than a commit that does four things and says so.

S26 part 2 — the curve declaration now matches reality. params[].curve stays
the mode-wide DEFAULT; a voice_spaces entry may now be {name, curve_overrides}
declaring only the slots where THAT voice space deviates. The 6 modes with one
voice space are byte-identical. The values were derived MECHANICALLY by a new
codegen/curve-audit.ts that models the four idioms a p[N]*p[N] regex misses
(alias form, memlcelium's implicit-counter sq() lambda, loop-generated indices,
smooth_params_), inlines helpers, and RAISES rather than guessing when it
cannot reduce an expression. A drift gate cross-checks 1179 (voice space x
param) slots against engine source on every run and was proved to fail loudly
on three drift classes. Application stays in the engine: nisps/engines,
nisps/pipeline and nisps/core are untouched, generated output is pure insertion
(755 insertions, 0 deletions), and the rebuilt nisps.wasm was byte-identical.

S4 / 7.2 — firmware reads the active mode's driver config at mode start, and
mic/line is real. My brief assumed the engine owns this; the code disagreed and
the code was right. sound_analysis_midi's EngineT is NoOpEngine — the mic lives
on a separately-composed AnalysisEngine member — so engine-level wiring would
have compiled, passed every gate, and left the one mic mode on line input.
Hence a mode-level seam defaulting to engine().driver_config(). Separately,
DriverConfig's defaults (line_level 0, output_volume 1.0) had drifted from
memllib's actual 3/0.8 because nothing had ever read them; wiring them as-is
would have made every silent mode louder and its line input maximally
insensitive — a behaviour change disguised as plumbing. Now pinned by a test.
Also: GetSysClockSpeed() panic()s on unsupported sample rates and runs on the
first line of setup(), so sample_rate needed a fallback ahead of clock setup.
CI's firmware env list gains soundanalysismidi — it is the only mic variant and
nothing else compiles that path.

Plan 5e — telemetry is real. A loss_history C-API entry across the full 5-layer
chain lets the browser read the per-iteration loss the core already records.
The audit named one fabrication site; there were two — wasm-iml.ts's
synchronous train() published lossHistory: [loss] as well. A third, ctx.loss,
was not merely dead but actively synthetic (fallbacks of prev * 0.82 and a
literal 0.5, rendered by nothing) and is deleted. The firmware buffer stays
untouched, per the L25 call. EngineApi.lossHistory() reads spine state rather
than the MLP handle, because trainAsync() fits on the worker's mirror net and
the handle would give a subtly-wrong second answer.

Plan 5f — engine throughput is measurable. One source compiled twice (CMake
natively, emcc for WASM) so the targets compare directly and no WASM export is
added. Sequencers are driven into a working state, and every row prints its own
working-state evidence so a number produced by an idle engine is visible rather
than plausible. Reports, never asserts: a wall-clock threshold on shared
hardware is meaningless or flaky, same call as the firmware size job.

ALIGNMENT: the telemetry defect is deleted (built, not deferred); the
performance defect is rewritten to what is actually left — these are HOST
numbers, and nothing measures the RP2350 at 150 MHz, which is the target the
mission's constraint is about. Q4 (memllib ownership) and Q5 (legacy feedback
modes) are closed.

Corrections to my own earlier claims, both found by agents contradicting the
brief: manifold/ONBOARDING.md was NOT "now accurate" — its primitives list
still named five deleted primitives and cited a seededGradient() that does not
exist. And the parity harness misses the sequencer engines because it runs 128
frames while their sequencers evaluate every 400-500 samples, NOT because
all-params-0.5 fails to trigger them (it does trigger: 0.5 maps to ratio 2,
firing three times per bar). The fix is a longer window, not different params.

Gates: run-all-tests.sh ALL GREEN — 4/4 ctest, parity PASS, lint clean, curve
drift 1179 slots ok, 39 e2e (was 33). Firmware: 5 envs built including the mic
variant.
2026-07-21 22:02:23 +02:00

29 KiB
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MAP

MEMLNaut-NISPS — Neural Interactive Shaping of Parameter Spaces. One C++20 codebase (nisps/) compiles to two targets: (1) Arduino/RP2350 firmware for the MEMLNaut hardware, (2) WASM in the Manifold React browser app that runs the same engines + ML through an AudioWorklet. (The former SolidJS playground was retired 2026-07-13 — branch archive/playground-solidjs, tag playground-solidjs-final; the browser-only C15 engine lives only there for now.) See CLAUDE.md for the long-form architecture narrative and ALIGNMENT.md for current strategic gaps.

Layout

nisps/ — platform-agnostic C++20 library (the only ML/DSP/engine code)

  • nisps/core/ — perf.hpp (hot-path/inlining attrs), types.hpp, concepts.hpp (MLEngine, AudioEngine, Mode), ring_buffer.hpp (SPSC lock-free cross-core channel, replaces pico/util/queue), event_queue.hpp (single-threaded in-engine event FIFO — deliberately NOT RingBuffer, which is an atomics-based cross-thread channel), rng.hpp (xoshiro256+ deterministic), math.hpp (fast_sigmoid, Curve enum + apply_curve).
  • nisps/ml/ — the MLP core, written once against a storage policy (mlp.hpp MLPCore<Storage>): storage.hpp (FixedStorage — template-sized std::array, zero heap; MLP<NIn,NH1,NH2,NH3,NOut> alias preserves the classic compile-time surface) and dynamic_storage.hpp (DynamicStorage — runtime dims, single arena alloc at construction; #errors on RP2350 builds, sole lint heap-allowlist entry). Fixed↔dynamic bit-parity enforced by tests/cpp/test_mlp_storage_parity.cpp. Files: mlp.hpp, activations.hpp, loss.hpp (MSE, no double-scaling), training.hpp (SGD + grad clipping), init.hpp (spread-aware uniform↔Xavier), rl.hpp (move_weights with output pin mask + per-layer scaling + weight decay), jolt.hpp (Jolt — held continuous weight-morph over the flat weight buffer + post-release LR ramp; ported from upstream InterfaceRL), ou_noise.hpp (OUNoise<N> — Ornstein-Uhlenbeck exploration walk on the output vector; ported from upstream InterfaceRL), feedback.hpp (FeedbackControllerCore<FbStorage> — the "Down Action" state machine: Avoid (geometric push-away default / Diffuse legacy) / RandomiseOutputs / RandomiseMlp / ExploreAndPlace; storage-policied like the MLP, own deterministic RNG, exposed via nisps_ml_feedback_* C API), replay.hpp (ReplayView — reward-tagged memory: dedup/deepen, k-NN positive centroid with deterministic tie-break, proportional decay+eviction), geo_push.hpp (push-away target computation, upstream InterfaceRL @ 0a541cc), warm_start.hpp (overlapping-weights copy for reshape), stats.hpp. generated/ml_defaults.hpp is codegen output (do not edit): nisps::ml::generated::kMlTrainDefaults, the ONE learning-rate / max-iterations / min-error default shared by firmware, WASM and VCV (source schemas/ml_defaults.json); MLPCore::set_train_config() and nisps_ml_set_train_config() override it at runtime. It lives under ml/ rather than modes/generated/ because nisps/ml sits below nisps/modes — mlp.hpp must not include upward. Jolt + OU are inert by default and wired into ModeBase, so every mode exposes jolt_press/jolt_release, jolt_lr_scale, and set_explore_intensity.
  • nisps/pipeline/ — the control-rate input/output processing chains (P4): input_chain.hpp (InputChain — invert→deadzone→circular clamp→momentum-modulated zoom→centred power→EMA→momentum; caller-supplied dt, internal clock, fixed velocity ring, serialisable state) and output_chain.hpp (OutputChain<NMax> — curve→EMA→slew→freeze(+mask), capacity-templated). Behaviour contract = the retired manifold TS pipelines, pinned by manifold/tests/fixtures/ and parity stage 7.
  • nisps/dsp/ — biquad.hpp, delay.hpp, reverb.hpp, filter.hpp, env.hpp, osc.hpp, pitch_shift.hpp, dc_blocker.hpp, plus the sequencer primitives shared by the sequencer engines: ratio_seq.hpp and seq_clock.hpp (bar phasor + MIDI clock + bpm). Lean primitives extracted from maximilian; daisysp PitchShifter replaced with custom granular impl.
  • nisps/engines/ — eight audio engines, each satisfying AudioEngine: paf_synth.hpp, channel_strip.hpp, xiasri.hpp, verb_fx.hpp, memlcelium.hpp, breakor.hpp (sequencer, NoOp audio), elysiamorf.hpp (sequencer, NoOp audio), analysis.hpp (input-side spectral features). Plus base.hpp (NoOpEngine, engine_id "thru").
  • nisps/modes/ — platform-agnostic modes binding {ML config, engine, voice space lambdas, abstract I/O channels}. Files: paf_synth.hpp, channel_strip.hpp, xiasri.hpp, verb_fx.hpp, memlcelium.hpp, slp_workshop.hpp (SLPWorkshopMode — the Synth Library Portland workshop build; reuses the MEMLCelium engine + MLP shape, foregrounds the Jolt + OU explore gestures), breakor.hpp, elysiamorf.hpp, sound_analysis_midi.hpp, external_synth_midi.hpp (ExternalSynthMIDIMode<const MidiDevice&, NOut> — joystick→MLP→MIDI CC for an external synth; compile-time device from nisps/midi; consteval pick_cc_slots curates which params fill the NOut slots; NoOpEngine, kRouteOutputsToEngine=false). base.hpp provides a CRTP scaffold eliminating the duplication that previously plagued firmware modes; it also owns driver_config() — the audio-driver setup (mic vs line, gain staging, sample rate) the platform glue reads at mode start. Defaults to engine().driver_config(); a mode overrides it with an optional on_driver_config() hook only when its engine is not what consumes the audio input (sound_analysis_midi, whose analyser rather than its NoOp engine owns the mic). generated/ contains codegen output (do not edit by hand): per-mode k<Mode>Schema ParamSchema instances, the <Mode>MLP type aliases built from the schema's own dims, and schema_types.hpp which now owns the ParamSchema struct itself. Mode headers no longer hand-write either their schema aggregate or their net shape.
  • nisps/wasm/bindings.cpp — flat C API exported to WASM (Emscripten target only).
  • nisps/midi/generated/midi_devices.hpp — codegen output: no-heap constexpr external-MIDI-synth templates (nisps::midi::generated; MidiParam/MidiDevice + kMidiDevices registry). Source = schemas/midi_devices/; do not edit by hand.
  • nisps/CMakeLists.txt + nisps/build/ — host-target builds + ctest.

firmware/ — PlatformIO project + hardware glue

  • firmware/MEMLNaut-NISPS/platformio.ini — the variant registry: one [env:<alias>] per firmware variant (16 of them), each passing -DMEMLNAUT_MODE_TYPE=<alias>; selftest passes -DNISPS_SELFTEST=1 instead. There is no second list to keep in sync. Shared [env] base pins the platform wrapper + arduino-pico framework, sets -std=gnu++20 -O3 (via build_unflags, because the framework appends its own -std=gnu++17 -Os AFTER project flags), reaches nisps/ with -I${PROJECT_DIR}/../.., and carries the TFT_eSPI panel config as -D flags. Build: pio run -e <alias>, or scripts/build-firmware.sh [--all].
  • firmware/MEMLNaut-NISPS/src/main.cpp — entry point (was MEMLNaut-NISPS.ino). Forks on NISPS_SELFTEST: normal modes run the engine/ML path; the SelfTest variant delegates all four entry points to glue/selftest.hpp.
  • firmware/MEMLNaut-NISPS/glue/ — hardware bindings:
    • audio_driver.hpp — bridges memllib AudioDriver callback → Mode::process(stereosample_t), and brings the codec up on the active mode's driver_config() (setup_audio_driver) plus publishes its preferred sample rate before the system clock is derived from it (apply_mode_sample_rate). Mic vs line input is therefore a mode-level declaration, not a firmware constant.
    • codec_config.hpp — pure, Arduino-free clamping of a nisps::DriverConfig to SGTL5000-representable values + sample-rate resolution (unsupported/"don't care" → 48 kHz, because AudioDriver::GetSysClockSpeed() panic()s otherwise). Host-tested by tests/cpp/test_mode_driver_config.cpp.
    • peripherals.hpp — joystick / pots / buttons → Mode::set_input and ML primitives. Wires the shared FeedbackController ExploreAndPlace lifecycle (MomA1 = enter/exit explore, MomA2 = freeze/place, TogB2 = commit; MomB1/MomB2 = reroll/nudge while exploring or grab/drop reposition while idle) plus the adaptive-learning gestures: TogB1 = Jolt (held weight morph), RVX1 = exploration amount (OU output walk). Reposition relocates an existing positive example's output to a new input position (feedback.hpp begin_reposition/commit_reposition) — no scratchpad, no weight restore.
    • midi_io.hpp — MIDI in → mode note_on/update_bpm/set_playing; drains ControlEvent ring → MIDI UART.
    • mode_select.hpp — type aliases mapping firmware mode identifiers to nisps::modes::*Mode C++ types, selected by the -D from platformio.ini. Includes the six MEMLNautModeExtSynth* external-synth variants (one per device template in nisps/midi, e.g. MEMLNautModeExtSynthSub37). The NISPS_ST_*/NISPS_ST_CAT token-paste table and the SelfTestRig tag type are GONE — selftest is now just an env with its own -D.
    • selftest.hpp — standalone guided hardware self-test rig (SelfTest variant; no engine/ML). Step-driven state machine on a SelfTestView: TFT prompts the operator through every control, auto-advances on detection, encoder-press skips. Ends with optional L/R/BOTH sine-sweep headphone check (core 1 block callback) + MIDI loopback-cable test. Lives firmware-side (touches TFT + raw pins) so it stays out of platform-agnostic nisps/.
    • output_router.hpp — top-level drain_outputs() entry point. (Inputs are wired directly by peripherals.hpp's bind_peripherals().)
    • settings_view.hpp — wire_settings(mode): adds on-device settings views to the MEMLNaut display carousel (TFT + rotary encoder). Joystick Dual/Single toggle for the 4-input ("two 2-D joystick") modes — "Single" pins ML input channels 2,3 to neutral via ModeBase::set_input_pinned (no net rebuild). Registered in the .ino after addSystemInfoView().
  • firmware/MEMLNaut-NISPS/lib/memllib/ — vendored memllib (was the src/memllib submodule): hardware abstraction (audio driver, TFT display, MIDI, peripherals), ~1.9 MB / 100 files, examples/ dropped. VENDORED.md records the upstream commit and the re-sync procedure; LICENSE is MPL-2.0, copied verbatim. Sources must sit under lib/memllib/src/ — PlatformIO's library builder falls back to a flat root-only scan without it and silently compiles nothing while still linking (see VENDORED.md).
  • firmware/README.md — structure + build instructions.
  • firmware/useq-celium/ — standalone RP2040 firmware (PlatformIO, Arduino-Pico core) that turns a uSEQ module + CV expander into a USB→CV/gate converter driven by the manifold cvgate backend. shared/protocol.h is the v2 wire-protocol single source of truth (mirrored by manifold/src/backends/useq-protocol.ts); main/ (USB serial → CV1–3 + GATE1–3, I2C → expander) and expander/ (I2C slave → CV4–11). Wire spec: docs/specs/useq-cv-protocol.md. Restored from the April-2026 "uSEQ-Celium" mode.

manifold/ — Vite + React + TS convertible-mode app (the sole browser app)

The Manifold "convertible" Console on the real engine, deployed at meml.lnfinitemonkeys.org/next (staging, alongside the live vanilla a-immersive at /). Built 2026-06-27/28; see docs/specs/plans/BUILD-PLAN.md (resume anchor + locked decisions) and the docs/specs/*-spec.md set.

  • manifold/src/engine/ — the parity-tested TS engine (same nisps.wasm), made framework-neutral: wasm-iml.ts (rewired off Solid stores onto an injected EngineSink), engine-host.ts + worklet/nisps-processor.ts (audio), thin WASM wrappers over the core pipelines + curve catalog (the TS input-pipeline/output-pipeline/curves implementations died at P4), wasm-worker.ts, spine.ts (the reactive spine BELOW React — setInput derives processed→ml→routed eagerly off-render), engine-api.ts (EngineApi façade incl. feedback.* wrappers over the nisps_ml_feedback_* C ABI), EngineProvider.tsx/useEngine.ts (React binding via useSyncExternalStore version counter). nisps.js is loaded via fetch+indirect-eval (Emscripten MODULARIZE glue has no ES exports), base-aware via document.baseURI for the /next sub-path.
  • manifold/src/primitives/ — the 7 design primitives as typed React (Badge, Button, PillToggle, Slider, Switch, VirtualJoystick, XYPad). Five unused ones were deleted in the 2026-07 sweep (L22).
  • manifold/src/console/ — the convertible Console: ConsoleApp, CompositeStage (single-divider convertible with snap/magnetism/minimap-demotion), OutputStage/SandwichStage/ParticleStage/Manifold (canvas, rect↔circular + feedback markers), Dock (top Mode selector + 5 vertically-centred drawers), Drawers (Learning/Inputs/Outputs/Settings/Help), TrainingHealth (real per-iteration loss curve from nisps_ml_loss_history + per-layer weight health from nisps_ml_get_layer_stats; rendered only at the Learning drawer's expanded depth — that IS the advanced-surface flag), VerdictCluster (mode-aware), OutputEditor/CurvePad, icons.tsx (monochrome currentColor SVG), model.ts (MF_MODES catalogue — schema-backed modes DERIVED from manifold/src/modes/generated/; carries per-mode ml net shape + engineId), output-mode.ts.
  • manifold/src/modes/generated/ — codegen output (*_schema.ts, do NOT hand-edit): ModeSchema consts (mode_id, engine_id, ml dims, params, voice_spaces, ui) — the SOURCE OF TRUTH for MF_MODES. Switching mode reshapes the WASM net to the mode's ml dims (ConsoleApp P5.3; boot mode paf_synth → 4→[10,10,14]→33).
  • manifold/src/dock/ — OutputControlRow (off/fixed/live + mute + solo/arm + min/max/curve), output-state.ts, OutputsBackendConfig.tsx (per-backend specialised Outputs panel — the sole per-backend editor).
  • manifold/src/backends/ — OutputBackend adapter + BackendManager (spine consumer); midi-backend.ts (WebMIDI), osc-backend.ts+osc-client.ts (OSC-over-WS), vcv-backend.ts (VCV-over-WS), cv-backend.ts (UseqCvBackend — uSEQ CV/gate over USB Web Serial, backend id cvgate) + useq-protocol.ts (v2 wire protocol, mirrors firmware/useq-celium/shared/protocol.h; useq-protocol.test.ts runs via bun test), particle-backend.ts, passthrough-backend.ts, presets.ts (named presets), manager.ts.
  • manifold/src/midi-devices/ — external-synth device templates. generated/ is codegen output from schemas/midi_devices/ (MIDI_DEVICES catalogue + MIDI_DEVICES_BY_ID, params by name+CC). The MIDI Outputs config (dock/OutputsBackendConfig.tsx) reads it for the device picker + param-select that fills the CC table.
  • manifold/src/inputs/ — modular INPUT layer feeding the ML head. The Inputs dock picks ONE exclusive mode (InputMode = internal | gamepad | midi; Internal/XY-pad is default). input-layer.ts owns a single rAF loop composing the active source's axes → one dedicated engine input slot per axis, 1:1, no blending → one setInputs, plus an onReducedInput callback the manifold tracks. The WASM net is over-provisioned to a 32-input head (MAX_AXES, nisps/wasm/bindings.cpp); unused slots are zero-padded and a zero input is inert, so idle sources cannot perturb the net. Mean-blending was removed deliberately — it diluted every source and biased the net toward idle sources' resting values. Changing the ACTIVE axis count offers a reshape (ConsoleApp → ReshapeModal): new net at the new arity, warm-started from overlapping weights, examples and feedback state reset; declining keeps the over-provisioned head. Sources: xy-pad-source (push-driven), gamepad-source (sticks→axes single/double; buttons emit press+release actions, bound in ConsoleApp to verdicts — LB/RB=down/up, X/Y/B=randomise/nudge/undo, A-hold=reposition), midi-input-source (device picker + BATCH "MIDI Learn": every CC swept while armed becomes an axis, shown as read-only meters). useInputLayer.ts is the React binding; base-source.ts shared status/action plumbing; types.ts the adapter contract. backends/base-backend.ts is its output-side counterpart (status + throttle + lastSent) used by the midi/osc/vcv transports.
  • manifold/src/feedback/ — controller.ts (Explore-and-place scratchpad + geometric-dislike + solo; a thin driver over the shared C++ core).
  • manifold/src/settings/ — settings-store.ts (monochrome icons, input-map shape, corner radius).
  • manifold/src/serial/ — memlnaut-serial.ts Web Serial scaffold + EditorPanel.tsx (MEMLNaut Editor mode).
  • manifold/src/engine/exploration.ts — Jolt press + OU explore gestures (Learning drawer): a thin timer-driver over the shared C++ core via the nisps_ml_jolt_*/nisps_ml_ou_* bindings (the interim TS math and jolt.ts/ou-explore.ts were deleted when P3 landed).
  • manifold/src/debug/probe.ts — window.__nisps (?debug=1). manifold/tests/e2e/ — smoke, probe-api (engine-contract port), spine (spine invariant + probe-survives-mode-switch), geo-dislike, reshape, schema-modes, training-health (the loss/layer-stats panel + its expanded-depth gating). E2E on the VPS runs via non-snap node (see BUILD-PLAN). manifold/tests/fixtures/ — golden parity fixtures (gesture trace, curves, input/output pipelines) captured 2026-07-13 pre-P4, guarded by tests/pipeline-golden.test.ts (in bun run test). tests/loss-history.test.ts drives the nisps_ml_loss_history C ABI straight at the committed WASM — the training path parity-check never touches. manifold/osc-bridge/ — Deno WS↔UDP-OSC bridge.

vcv/ — VCV Rack 2 plugin (MEMLNaut module, WIP)

Native C++ Rack module: ML CV-mapper with RL feedback + a browser bridge. 8 inputs × 16 outputs + per-output LED rings, palette from the frontend tokens, WS↔OSC browser bridge (see docs/specs/vcv-module.md). src/MEMLNaut.cpp (module, 8→[16,24,16]→16), src/iml.hpp (**thin adapter over nisps::ml::MLPCore<DynamicStorage>

  • core nisps::Rng** — P6 reunification 2026-07-18, closes vcv-module.md delta #5; behaviour is now core-exact, pinned by tests/cpp/test_vcv_iml_parity.cpp), src/osc_server.hpp (bridge, transport-only), src/plugin.{hpp,cpp}, res/*.svg (panels), Makefile (needs RACK_DIR). Builds against the current ../nisps/ core via relative includes; no nisps-core.

schemas/ — JSON parameter contracts (firmware/browser source of truth)

  • schemas/schema.json — Draft 2020-12 meta-schema validating mode files.
  • schemas/modes/<mode>.json (×9) — each mode's params, ranges, defaults, curves, voice spaces, ML config. (slp_workshop.json reuses engine_id: memlcelium.) params[].curve is the mode-wide DEFAULT response curve; a voice_spaces entry may be an object {name, curve_overrides} declaring only the slots where THAT voice space deviates (index i == VoiceSpace ordinal i). Descriptive throughout: the curve is applied exactly once, inside the engine's voice space.
  • schemas/modes/params_notes.md — provenance notes and judgement calls per mode, plus the exact square/sqrt/linear predicate the drift check enforces.
  • schemas/midi_device.schema.json — Draft 2020-12 meta-schema for external-MIDI-synth templates.
  • schemas/midi_devices/<device>.json (×6) — CC-controllable external synths (Moog Sub 37 / Sub Phatty, Creamware Pro-12 ASB, Elektron Analog Keys, ASM Hydrasynth, Roland JD-800). Each param: {id, cc, label, min, max, default, group}. Canonical source for both firmware + browser device pickers. Verified-CC provenance + sources live in schemas/midi_devices/sources/synth-midi-cc.json (a sources/ subdir, because the generator ajv-validates every *.json directly under midi_devices/ as a device template).

codegen/ — schema → C++/TS code

  • codegen/generate.ts — Bun script: validates schemas via ajv (incl. the P5 firmware-fit check: exactly 3 hidden layers, dims ≤4096), emits per-mode C++ nisps/modes/generated/<mode>_schema.hpp (constexpr, nisps::modes::generated) AND TS manifold/src/modes/generated/<mode>_schema.ts (+ types.ts, index.ts). Idempotent; golden-tested in run-all-tests.sh stage 5. The TS output is the SOURCE OF TRUTH consumed by MF_MODES (manifold/src/console/model.ts).
  • codegen/generate-midi-devices.ts — separate Bun script (isolated from the mode golden test): validates schemas/midi_devices/ via ajv, emits nisps/midi/generated/midi_devices.hpp (no-heap constexpr) and manifold/src/midi-devices/generated/{types,devices,index}.ts. Idempotent.
  • codegen/curve-audit.ts — reads nisps/engines/*.hpp and derives, per voice space, which response curve the engine applies to each NN-output slot. Handles the four idioms a regex misses (const float v = p[n]; v*v, memlcelium's implicit-counter sq() lambda, loop-generated indices, smooth_params_[n]) and RAISES on anything it cannot reduce rather than defaulting to linear.
  • codegen/tests/curve_drift_test.ts — the gate: schema-declared curves (JSON and generated TS) must equal what curve-audit.ts extracts, and schema voice_spaces order must equal the engine's kVoiceSpaceNames. Source-level by necessity — the curve is not recoverable from engine output. Run by run-all-tests.sh stage 5, CI, and bun run test in codegen/.
  • codegen/lib.ts — helpers shared by both generators. codegen/tests/golden/ — golden snapshot for paf_synth (C++ + TS).

tests/cpp/ — host C++ tests

  • Per-component tests: test_dsp_*.cpp, test_engine_*.cpp, test_mlp_*.cpp, test_mode_*.cpp, test_ring_buffer.cpp, test_rng.cpp, test_math.cpp. Helpers in test_helpers.hpp.
  • Verification: ml_golden_vectors.cpp, engine_impulse.cpp (+ engine_impulse_baseline.bin), parity_check.cpp + parity_wasm.mjs + parity_diff.mjs — native-vs-WASM bit-equivalence within 1e-5.
  • Measurement (asserts nothing): engine_bench.cpp + bench_report.mjs — per-engine throughput (ns/sample, blocks/s, realtime factor) for the process() hot path. ONE source compiled twice (CMake nisps_engine_bench natively, emcc for WASM) so the two targets are comparable without adding a single export to nisps/wasm/bindings.cpp. Engines are driven into a working state (transport running + event drain for the sequencers, periodic note_on for paf_synth, a noise+sine input bed for the fx/analysis engines) and every row prints its own working-state evidence, so a number produced by an idle engine is visible rather than plausible. Driven by scripts/bench-engines.sh.

scripts/ — build + verify entry points

  • build-firmware.sh, flash-firmware.sh, build-and-flash-firmware.sh, firmware-common.sh — Arduino-CLI wrapper for RP2350 target with C++20 flag.
  • build-wasm.sh — Emscripten compile producing manifold/public/nisps.{wasm,js}.
  • build-cpp-tests.sh — CMake configure + build + ctest (Ninja).
  • parity-check.sh — runs native + WASM and diffs binary outputs.
  • bench-engines.sh — engine throughput on native + WASM; --compare <report.json> prints per-engine Δ%. Reports, never asserts (a wall-clock threshold on shared hardware is meaningless or flaky — same call as the firmware size job). Reports land in nisps/build/bench/.
  • lint-cpp.sh — .f literal warn + heap/Arduino.h violation fail.
  • run-all-tests.sh — master verification script.

.github/workflows/

  • ci.yml — GitHub Actions: cmake build + ctest + WASM build + parity check + lint + Playwright (cpp-tests + manifold-tests jobs). Firmware compile is documented as manual.

src/ — submodule + vendored trees

  • There are no submodules. src/memllib was one until the Phase 4 PlatformIO migration; it is now vendored at firmware/MEMLNaut-NISPS/lib/memllib/. Fresh clones need no git submodule step.

Top-level docs

  • CLAUDE.md — long-form architecture narrative.
  • MAP.md — this file.
  • ALIGNMENT.md — strategic gaps + open mission questions, dated, opinionated.
  • README.md — short quickstart.
  • AGENTS.md — canonical agent contract: architecture, build/test, scope, and Ergo workflow.

Entry points

  • Firmware: scripts/build-firmware.sh [VARIANT] (interactive prompt if omitted), scripts/flash-firmware.sh, scripts/build-and-flash-firmware.sh. Target: rp2040:rp2040:solderparty_rp2350_stamp_xl:opt=Optimize3, -std=gnu++20.
  • Manifold dev: cd manifold && bun install && bun run dev (Vite, COOP/COEP headers).
  • Manifold build: cd manifold && bun run build.
  • WASM rebuild: bash scripts/build-wasm.sh (needs emcc).
  • Host C++ tests: bash scripts/build-cpp-tests.sh.
  • Parity check: bash scripts/parity-check.sh.
  • Engine benchmark: bash scripts/bench-engines.sh (add --compare nisps/build/bench/latest.json to diff against the previous run).
  • All tests: bash scripts/run-all-tests.sh (stage 6 is a bench smoke report; it does not gate).
  • Playwright: cd manifold && node node_modules/.bin/playwright test (non-snap node runner on the VPS — BUILD-PLAN gotcha; bunx playwright test works elsewhere).
  • Codegen: cd codegen && bun run generate.ts (regenerates nisps/modes/generated/ + nisps/ml/generated/ C++ and manifold/src/modes/generated/ TS).

Conventions

  • Firmware mode selection is compile-time only — one -DMEMLNAUT_MODE_TYPE per [env:] in platformio.ini.
  • nisps/ follows Chris's RP2350 perf rules: no heap, static const float for non-trivial constants, strict .f suffix. perf.hpp now carries only NISPS_HOT/NISPS_FORCE_INLINE; the three dead/misshapen SRAM-section macros were deleted in the 2026-07 sweep (S21/L13).
  • C++ identifiers: PascalCase types, snake_case functions/variables, kPascalCase constexpr. JSON keys snake_case. TS types PascalCase, components PascalCase.tsx, modules kebab-case.ts.
  • Curve enum lives in nisps/core/math.hpp (lowercase: linear/exp/log/square/sqrt/sigmoid/cubic, plus the parameterised centered_power free function); generated mode headers re-export via using Curve = ::nisps::Curve;. Since P4 there is NO TS mirror — the browser samples the WASM catalog (nisps_curve_apply(+batch)).
  • Modes are TSX components composed of primitives; mode parameter contracts are JSON schemas with codegen → C++ and TS types (MF_MODES derives params/ml-config from the generated schemas since P5; labels/ordering stay a manifold overlay). No declarative JSON UI.
  • WASM and firmware share the same C++; the browser MLP is runtime-shaped (MLPCore<DynamicStorage>, since P2): nisps_ml_create honours (input, output, hidden[3]) with non-positive/null args defaulting to 32→[10,14,18]→126; nisps_ml_reshape warm-starts a new shape. Firmware keeps compile-time MLP<...> (zero heap). Per-mode dims are schema-real on both targets since P5.3 (the browser reshapes on mode switch).
  • Cross-platform parity: scripts/parity-check.sh enforces native vs WASM agreement within 1e-5.

Gotchas

  • Firmware needs PlatformIO: nix-shell -p platformio-core. Use platformio-core, NOT platformio — the latter is nixpkgs' bubblewrap-wrapped FHS build and fails without a working user namespace. First build pulls ~1-2 GB into ~/.platformio.
  • firmware/MEMLNaut-NISPS/glue/mode_select.hpp #undefs Arduino macros (sq, min, max, abs, round) before pulling nisps headers — engines use those identifiers as method names.
  • nisps_firmware::g_active_mode_bridge is extern in glue/audio_driver.hpp and defined in src/main.cpp; combining inline with __not_in_flash produces a comdat conflict at link time.
  • pio run's own "Flash: NN%" console line double-counts .data on this board (PlatformIO's generic size checker counts every PROGBITS+ALLOC section). Compare arm-none-eabi-size -A — flash = .text+.rodata — before believing a size regression.
  • nisps_modes_tests builds against generated schemas under nisps/modes/generated/; if you add a new mode, regenerate via bun run codegen/generate.ts before building. It also compiles one firmware header (glue/codec_config.hpp), so the repo root is on its include path.
  • nisps::DriverConfig's member defaults are load-bearing: they reproduce memllib's historical hardcoded codec setup, so a mode that declares nothing gets exactly the pre-wiring behaviour. Changing them changes the codec setup of every mode that expresses no opinion (pinned by tests/cpp/test_mode_driver_config.cpp).

Smells / strategic concerns

See ALIGNMENT.md.

Specs

  • Root: docs/specs/
  • Entry: MAIN.md
  • Layout: flat (with plans/, recon/, _archive/ subdirs)
  • Index: none (intentionally — generate when a consumer exists)
  • Skill: invoke /specs to review/maintain/add/navigate.
  • Conventions: Four-genre ontology — kind: spec (timeless contract, wins by intent), kind: plan (status: active|executed|superseded, never authority for behaviour), kind: finding (dated, immutable, exempt from drift lint), ADRs in docs/adr/.

The corpus holds platform-level specs (engine architecture, I/O backends, feedback design), implementation specs (port specs, wire protocols), feature specs (e.g. slp-workshop-firmware.md), historical findings (dated research artifacts), and finite build plans. Before changing behaviour a spec covers, find it via /specs; the spec wins by intent — if it's wrong, update it in the same commit as the code.