CATCH—22

Seeded mismatch

Each channel carries its own unit spread — g ±3%, k ±4%, drive bias, self-osc threshold — seeded at boot. Zero the mismatch and the two channels cancel bitwise; the difference you hear is the model.

Slow drift

An ultra-slow random walk (30–120 s time constant, clamped at ±0.4% of cutoff) makes the twins breathe apart over minutes. Audible on drones, invisible on drums — exactly like hardware settling.

Warm-up

Like the original, the unit settles as it warms: the applied range grows from ±1.2% to the full ±3% over 90 seconds. The MISMATCH bay has the gauge and a WARM bypass for A/B work. NEW TWIN re-rolls the pair.

Two 12 dB multimode stages

LP · BP · HP · NOTCH from one state-variable core, with the original's character: crossover-distortion bias that rises below 1.28 kHz, a state clipper that catches self-oscillation level-consistently, odd grit that grows with resonance, and bass retention — the sub survives the sweep within half a dB.

Three wirings

Dual mono, series (the two 12 dB stages stack into a 24 dB chain — the patch cord draws itself across the panel), and stereo parallel. LINK FREQ lets one cutoff knob drive both channels; LINK CV shares the control voltage.

LOW PASS

Removes content above the cutoff. The default muscle of the filter.

BAND PASS

Removes above and below — the noise bay's best friend.

HIGH PASS

Removes below; nasally, aggressive, great against a bass.

NOTCH

Removes a band at the cutoff — sweep it for pseudo-phaser motion.

MONO SINGLE

Feed IN 1, take OUT 1: one 12 dB voice. The second filter stays free for a second signal — two performers, one unit.

MONO DUAL — SERIES 24 dB

Patch OUT 1 into IN 2: the panel draws the cord and the two stages stack into a 24 dB chain. LINK FREQ ties both cutoffs to one knob — the classic wall.

STEREO

Left into IN 1, right into IN 2: two channels, two modes, two filters that never quite agree. The default — and the point.

The hardware manual taught these three patches; the instrument draws them for you — the series cord and the LINK cord render across the panel exactly as you patch them. Full recipes in the field manual.

NYDUS room overlay (P)

The family link gets a face: sibling cards with their protocol-§8 peer dots (green local / blue LAN / hollow absent), the three family links — LUNAR bus → twin filter IN, filtered return OUT, PULPO clock IN — drawn as lit nodes with live activity, the trio badge, and an honest state footer. Presentation only: the links self-assemble on presence, exactly as they always did.

Inbound PARAM surface

A sibling score can now breathe the twin filters over the family bus: bounded, validated cutoff / resonance / mode messages, clamped at the engine — documented in the field manual. The room can move the filter without touching the panel.

Family capture

CATCH22_REC=1 records the post-return master to the save dir — the filtered bus, as heard by the trio. CATCH22_WINDOW=WxH sizes the boot window for multi-instrument session hosts.

LAN discovery (Tier-2)

Machines on the same network find each other over a multicast beacon and link over TCP — still zero configuration. A peer from another machine lights the blue LED and shows measured milliseconds. No multicast on your network? Point units at each other once with NYDUS_LAN_DIAL; NYDUS_TIER2=0 keeps the unit local-only; NYDUS_LOCKDOWN=1 is the venue switch. If a daemon ever dies, the unit respawns and re-links it within seconds — the room heals itself.

CHARACTER — starve & drip

The twin filters now carry the cell's temperament (research transfer from LUNAR-24, validated against Barton's Atomika breadboard notes and the programmable-op-amp datasheets): at maximum resonance the ring starves — strangled, yet it still rings — and the new DRIP knob in the app bay drives the amplitude-conditional "dripping water" instability. Intrinsic at rest; APP-badged; presets carry it.

Fused installers

A single-file Linux AppImage, a fused Linux zip and a fused Windows exe — each carries the real-time audio bridge, the kernels and the nydus daemon. Unzip (or don't) and play; the bare .love is still there for LÖVE 11.5 users.

Zero-touch discovery

Instruments on the same machine find each other automatically — no settings, no pairing dialogs. The status LED in the app bay is an honest meter: amber searching, green when a local peer is patched, blue for LAN peers (v2). When LUNAR-24 + PULPO-23 + CATCH-22 are all present, the set announces itself.

FX destination mode

Another instrument streams its bus into the twin filters and gets the filtered return — measured 2.67 ms round trip on a local machine. Jitter depth is tunable per link; stale audio is dropped, never queued.

Hardened wire

Framed control + media with per-peer queues: control reliable, stale media dropped. The conformance suite (discovery, clock alignment, parameter determinism, wire hostility, teardown) runs in every instrument's CI — wire compatibility by tests, not hope.