re: Interval and IntervalFluctuation are the cooldown; the chatter system closes
sub_82210C38 retires a line and is the only chatter function reading the rule's +20/+24 as words: node[+16] = Fluctuation * rand01 + Interval frames, state 0x20. Interval is a floor, Fluctuation a uniform additive jitter. The queue node IS the cooldown timer -- the tick counts +16 down and only then frees the slot, so the already-queued bail in sub_82210670 and the cooldown are one mechanism: a speaker cannot repeat an event until its node expires. A lingering node still holds one of the 128 pool slots. Also: +20 on the node is a ducking level, raised while a higher-priority line plays and released on retirement. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
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Claude (auto)
@@ -265,11 +265,12 @@ can never reach, because it skips the record first. Thirteen dead records out of
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### 🟡 What this does *not* settle
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`Probability`, the pick, the queue, `Priority` and the `Yes`/`No` flag are all
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settled above. **What remains is only the two interval fields:** whether
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`Interval` (`+20`) is a cooldown per event, per rule or per speaker, and what
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`IntervalFluctuation` (`+24`) randomises against. Neither is read by the entry,
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the pick, the enqueue or the tick paths read so far.
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All seven fields and the `Yes`/`No` flag are settled above; the static side of
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this system is complete. What is **not** established: the numeric effect of the
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ducking level at `node[+20]` (its mechanism is clear, its attenuation is not),
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what the state values other than `0x10`/`0x20` mean, and whether
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`sub_822168E8`/`sub_82217980` do anything beyond stop/resume. None of these
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change the data model a port needs.
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🔴 One handle was tried and refuted: searching the whole image for functions
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that touch `+16`/`+17`/`+18`/`+20`/`+28`/`+32`/`+36` returns dozens of unrelated
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@@ -473,6 +474,64 @@ The tick also branches on `Pattern < 3` (using `this+8776` on the taken side), s
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`Window` (3) is on a different presentation path from `Sound` (1) — consistent
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with the two values the disc ships.
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## ✅ `Interval` and `IntervalFluctuation` — the cooldown, and the system closes
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**Settled 2026-08-27** from `sub_82210C38`, the retire-a-line routine (called
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from the tick `sub_8220FC50` and from `sub_8220FB90`). It is the only place in
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the chatter code that reads the rule's `+20` and `+24` as **words**, which is
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what distinguishes them from the byte fields at the same offsets in the queue
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node.
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When a line finishes:
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```
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rule = node[+12]
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if rule:
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f1 = rand01() ; sub_8220D970
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f0 = (float)rule[+24] ; IntervalFluctuation, frames
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f13 = (float)rule[+20] ; Interval, frames
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node[+16] = (int)(f0 * f1 + f13) ; fmadds
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else:
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node[+16] = 0
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node[+24] = 0x20 ; state: cooling down
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```
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✅ **`Interval` is a floor and `IntervalFluctuation` is uniform additive jitter**:
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the cooldown is `Interval + IntervalFluctuation · rand01` frames, i.e. uniform
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over `[Interval, Interval + IntervalFluctuation)`. On the disc that is
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`Interval ∈ {0,3,4,5,30,120}` seconds with a jitter of `0` or up to `+2` seconds
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(813 records carry `IntervalFluctuation 2`).
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✅ **The cooldown is per (speaker, event), and the queue node *is* the timer.**
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`node[+16]` — the field that held `EffectiveTime` while the line was playing — is
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reused for the cooldown. In state `0x20` the tick decrements it each frame and,
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only when it reaches zero, unlinks the node, clears `[node+23]` to free the pool
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slot and decrements the count:
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```
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node[+16] -= elapsed
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if node[+16] > 0: keep waiting
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else: unlink; node[+23] = 0; [this+8740]--
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```
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That closes the loop with the duplicate check in `sub_82210670`, which refuses to
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fire when a node with the same `(speaker, rule)` is already in the list. **The
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"already queued" bail and the cooldown are the same mechanism**: a retired line
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keeps its node alive for `Interval + jitter` frames, and for exactly that long the
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same speaker cannot repeat the same event. Nothing per-rule or global is
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involved — the rule object itself holds no timestamp.
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⚠️ **Port note:** the lingering node still occupies one of the **128** pool slots.
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A long `Interval` (120 s = 7 200 frames) parks a slot for two minutes.
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The same routine also stops the presentation — `sub_822168E8` on `this+8776` for
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`Pattern` 1, or on `node+28` when `Pattern ≥ 3` — and, when `[node+20] == 1`,
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sweeps the pending list calling `sub_82217980(…, 0)` on every node whose state is
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not `0x10`. Together with `sub_82210AF0` (which returns the largest `[node+20]`
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among *higher*-priority pending nodes) that makes `+20` a ducking level: raised
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while a higher-priority line plays, released when it retires. The exact
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attenuation is not established here.
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## 🟡 Not settled
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* The *policy* the seven fields drive — see "what this does not settle" above.
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