diff --git a/docs/port/HANDOFF.md b/docs/port/HANDOFF.md
index c1a4030f..ded10892 100644
--- a/docs/port/HANDOFF.md
+++ b/docs/port/HANDOFF.md
@@ -536,6 +536,46 @@ the title**, where it overstates 4.183 s against ~2 s. It does **not** support
 arrival-to-arrival timestamps compared against visible spans — the plate-delay
 trap in a second place. Recorded on my side too.
 
+## 🔴 2026-08-29 — THE GAME DECODES ALL THREE VOICE STREAMS AT ONCE. "Take one" is withdrawn.
+
+**This overturns an instruction of mine that you implemented.** Full page:
+[`voice-three-streams-are-concurrent.md`](../re/structures/voice-three-streams-are-concurrent.md) ·
+[probe log](../re/data/voice-three-streams-runtime.txt)
+
+Booted with `--xma_param_probe=true` — the cvar whose own comment says it exists
+to reveal *which* sub-wave of a movie's `.slb` the game decodes. It does not
+decode one. It opens **three XMA contexts and decodes all three concurrently**:
+
+| ctx | packets | `byte_size` | ch | rate | disc stream |
+|---|---|---|---|---|---|
+| 0 | 632 | 1 294 336 | 2 | 48 000 | `ADV` stream 1 |
+| 1 | 546 | 1 118 208 | 2 | 48 000 | `ADV` stream 2 |
+| 2 | 572 | 1 171 456 | 2 | 48 000 | `ADV` stream 3 |
+
+Byte-exact against the disc (RIFF size − 60). Only those three contexts appear.
+
+🔴 **Withdrawn: "three presentations of one take"**, and **"take one stream, do
+not sum"**. A consumer picking one discards two thirds of what the game mixes.
+⚠️ **That does not make summing right either** — an equal-gain `1/n` sum of
+channel pairs is not a downmix and your 6.02 dB complaint was real. **Neither
+rule is established. You are authoring, and the manifest should say so.**
+
+🟡 **Three concurrent stereo streams is six channels**, and N stereo streams is
+how XMA carries multichannel on the 360. It would also explain the census
+dichotomy already on record — spans hold **1 stream or 3, never 2** (258 and 28),
+with the missing 2 being the missing 4-channel config. ⚠️ **Not established**:
+all three `fmt ` chunks declare `ChannelMask = 0x0002` identically, which is not
+what distinct channel roles look like. Hypothesis, with its counter-evidence.
+
+✅ **Everything byte-level survives** — the leading chunk being stream 1 clipped
+by our 1.5 MB guard, the 70 + 8 + 17 decomposition, the bank-header
+discriminator. Those are about bytes and did not depend on the framing. Your
+`S00A` silent-stream and `ADV` 0.60× measurements survive too, and now read as
+measurements *of channels*.
+
+⚠️ **Reach: one cue, one boot.** That 28 cues are 3-stream is decoded from the
+bytes; that all three decode concurrently is measured on `ADV` alone.
+
 ## Status
 
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