f3-title-plays-bgm-102-and-103.md's BGM census resolved a literal
`addi r5,r0,<imm>` before every call to the play primitive, which is blind by
construction to a cue id supplied any other way. Two of the primitive's 34
callers ARE supplied another way -- one is a register passthrough inside a
generic 6-caller wrapper `sub_821CCCB0(obj, cueId)` with a -1 "don't play"
sentinel. One of its six callers chains back to slot 1 of GamePart_Title's
OWN dispatch table at 0x820a3dec, identified by its adjacent
RegisterToFactory<0, class silph::GamePart_Title> string -- the same
convention already used disc-wide for the other 28 GameParts, not a
neighbourhood guess this time.
Traced as far as static analysis goes: the field that would carry the cue id
traces to a 19-caller shared helper's return value, too common to be
title-specific -- reads as "allocate a sound-emitter handle", not "here is
the cue". The value most likely gets set at whatever runtime moment the game
wants this emitter to speak, which a disassembly listing does not contain.
Classified undecodable-with-reach, not a fourth thing -- narrower and
better-aimed than the prior reach ("SE goes through a different call").
Every address cited was independently re-decoded from the raw .pe bytes
(file offset = VA - 0x82000000), not taken from the database's own
mnemonic/operands columns, and all agree.
Refutation attempt this iteration: checked whether the "6 callers is
exhaustive" claim for sub_821CCCB0 survives indirect dispatch (a plain
kind='call' xref scan is blind to a vtable/function-pointer-array entry).
Checked function_pointer_array_entries and kind='ind_call' xrefs for all
four functions in the chain -- none found. The claim survives.
What would close it: --xma_param_probe=true during a title boot's build-in,
watching for a newly-decoded stream when the plate reaches full alpha with
no input -- the same technique menu-audio-cues.md used for the menu's SE
census. Not run this iteration; this is the static half only.
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