scenechange

atlantisCatalyst · modulation · schema v1

SCENECHANGE (internal type id stays `atlantisCatalyst` for save compatibility) — a slow-drift "macro brain" that nudges a whole patch into new states without you touching every knob. Emits eight correlated band-limited random-walk CV outputs (drift1–drift8): a COHERENCE control sets how tightly each channel tracks a shared "weather" voltage versus wandering independently, and the drift rate ranges from a few seconds to minutes between scene changes. A scene_pulse gate fires on each transition to a new attractor, scene_idx CV reports the current scene for downstream sequencing, and a transport row (play + scene1–4 gates) plus a manual NUDGE gate and a FREEZE latch give explicit scene recall. Pure JS (eight ConstantSourceNodes driven by a ~40 Hz orchestrator with smoothed transitions). The "catalyst-controller" of the Atlantis-patch concept.

A slow-drift 'macro brain' (displayed as SCENECHANGE) that nudges a whole patch into new states without you touching every knob. It emits EIGHT correlated CV outputs (drift1–drift8), each a smooth band-limited random walk; a Coherence control sets how tightly the eight tracks move together versus wandering independently, and a Chaos control sets how much they jitter. On a timer (Drift sets the spacing, from a few seconds to minutes) — or on demand via the NUDGE button/gate — it transitions to a fresh 'scene', ramping all eight outputs smoothly to new targets. A scene_pulse gate fires on each transition and a scene_idx CV reports which scene is current, so downstream sequencers can follow along. You can save up to four scenes and recall them deterministically (the queue CV inputs jump straight to a scene), and FREEZE latches every output where it stands. Patch the drift outputs into filter cutoffs, mix levels, FX depths — anywhere you'd want hands-free, slowly-evolving modulation.

the faceplate

9 inputs · 10 outputs · 7 params

about this module

Hover a control, or open the patch panel and hover a jack.

inputs

id	cable	what it does
`play_cv`	gate	Shared transport play gate (reserved for transport sync); ATLANTIS-CATALYST takes its scene jumps from the queue inputs below. gate / trigger
`reset_cv`	gate	Shared transport reset gate (reserved for transport sync). gate / trigger
`queue1_cv`	gate	A rising edge jumps to scene 1 — recalling its saved snapshot if one exists, otherwise making a fresh transition toward scene-index 1. gate / trigger
`queue2_cv`	gate	A rising edge jumps to scene 2 — recalling its saved snapshot if one exists, else a fresh transition. gate / trigger
`queue3_cv`	gate	A rising edge jumps to scene 3 — recalling its saved snapshot if one exists, else a fresh transition. gate / trigger
`queue4_cv`	gate	A rising edge jumps to scene 4 — recalling its saved snapshot if one exists, else a fresh transition. gate / trigger
`nudge`	gate	A rising edge manually triggers the next scene transition (the same as the card's NUDGE button), cycling the scene index forward. Ignored while frozen. gate / trigger
`freeze`	gate	While this gate is held high, all eight drift outputs latch at their current values and stop wandering; drop it low (or toggle the card's FREEZE button) to release them. gate / trigger
`seed_cv`	cv	Per-instance seed CV: latches the random-walk generator's seed so the drift sequence can be made reproducible across sessions. control voltage (CV)

outputs

id	cable	what it does
`drift1`	cv	Smooth band-limited random-walk CV (-1..+1), channel 1; ramps toward a new target on each scene change and jitters within it by the Chaos amount. Patch into any modulation destination. control voltage (CV)
`drift2`	cv	Random-walk CV channel 2 — correlated with the others by the Coherence amount. control voltage (CV)
`drift3`	cv	Random-walk CV channel 3. control voltage (CV)
`drift4`	cv	Random-walk CV channel 4. control voltage (CV)
`drift5`	cv	Random-walk CV channel 5. control voltage (CV)
`drift6`	cv	Random-walk CV channel 6. control voltage (CV)
`drift7`	cv	Random-walk CV channel 7. control voltage (CV)
`drift8`	cv	Random-walk CV channel 8 — the eighth of the correlated drift bank. control voltage (CV)
`scene_pulse`	gate	A short gate pulse that fires on every scene transition (timer, manual nudge, or queued recall) — patch it where you want a downstream event to mark 'a new scene just started'. gate / trigger
`scene_idx`	cv	CV that reports the current scene as a voltage (-1..+1 across scenes 0..3), so another module can address its own scene/snapshot selector from this one. control voltage (CV)

params

id	label	range	default	curve
`driftRate`	Drift	0..1	—	log
`chaos`	Chaos	0..1	—	linear
`coherence`	Coh	0..1	—	linear
`sceneDepth`	Depth	0..1	—	linear
`autoMode`	Auto	0..1	—	discrete
`bias`	Bias	-1..1	—	linear
`level`	Level	0..1	—	linear

controls

control	what it does
Auto	Whether scenes change on their own: on (default) transitions automatically on the Drift timer; off means scenes only change when you nudge or send a queue CV.
Bias	A DC offset added to all eight drift outputs (-1..+1), tilting the whole bank's average higher or lower.
Chaos	How much micro-jitter the eight outputs add even while holding a scene (0..1): 0 is glassy-smooth, higher values keep the voltages subtly alive.
Coh	How tightly the eight channels move together (0..1): 0 makes them fully independent random walks, 1 locks them onto one shared 'weather' voltage, and 0.55 (default) is a balanced blend.
Drift	How long between automatic scene changes, from a few seconds (high) to several minutes (low) — how restlessly the brain explores new states (the card's Drift fader).
Level	Overall output amplitude of the eight drift CVs (0..1), ramped smoothly when changed to avoid clicks.
Depth	How far each scene transition moves the outputs (0..1) — small for gentle shifts, large for dramatic jumps between scenes.

source

atlantis-catalyst.ts on GitHub.