Version 3.2.2: in-memory replacements fill their slots exactly (padded ones played as silence)

docs/reverse-engineering/findings.md

@@ -125,6 +125,15 @@ Conclusion: approach A works end-to-end in-game. Use >= 30 s probes for the intr
     catalog had the same `<Bank>_<n>` name as an SFX WAD sound of the same bank (`CHR_RasBossFight_1`,
     `SEQ_DemonTrials_1`); they now take `<Bank>_<MEDIA>`, and a line's own name wins over another recording's
     position alias (`CHR_RadioScanner#1` in FRA). Every name of every catalog resolves to its own sound.
+24. (2026-10-10, gameplay test by the user) **Padded in-memory replacements play as silence.** All 568 Batman
+    footsteps were replaced; in game the original steps were heard and the replaced cape-open sound was silent.
+    Memory scan while walking: no original footstep WEM loaded, 137 replacements loaded; debugger: the
+    replacements' Vorbis setups are created and parsed OK (ret 0). Every untouched in-memory WEM fills its slot
+    exactly (RIFF size = DIDX size, 500 / 500 sampled), while the replacements were zero-padded. Filled with a
+    `LIST{adtl, labl}` chunk before `data` (55 in-memory originals carry cue+LIST chunks), every step plays the
+    replacement. ackit now fills every in-memory copy and every whole bank copy of a WAD recording
+    (`wem.fill`); WAD entries and prefetch heads keep zero padding (streamed playback is unaffected). The
+    remaining sound after each step is Batman's gear and cape foley (`CHR_BatmanFoleyBelt`, `..Cape`).
 
 ## Old path -> new path
 `scripts/harness.py` -> `ackit verify --ingame` (ackit/verify/ingame.py); `scripts/validate_builder.py` ->