Chain (every hop verified live): FootStep pulse (SetBodyAnimation, decay in
PerformAndWatch) -> AudioMatchOf match=1 -> Start(2.0) on the FootFall
DirectPatchSource... which the renderer DROPS because its volume is 0:
an AudioControlMixer (outCtl=3/Volume + a second outCtl=5 mixer) feeds the
source, and BOTH mixer inputs are 0 -- nothing ever sends them.
Eliminated as senders (all traced): AudioScaleOf scales (29 total, none target
the mixer), AudioControlMultiplier (one instance, other target), Random/
AudioSampleAndHold (RNG verified WORKING -- varied samples; RANDOM.cpp is in
the build, the self-init ctor runs).
HYPOTHESIS [T4, next session]: the mixer inputs are fed by AudioStateTriggers
on AnimationState keyed to the AUTHORED gait-clip ids (walk 2/3, run 8/9 =
per-gait footstep volume). Our runtime body SM walks in states 12<->13 --
which the recovered MechAnimationState enum names RightStandToReverse/
LeftStandToReverse. If the authored audio expects 2/3 for forward walk, the
runtime clip NUMBERING in the reconstructed gait SM is offset from the
authentic ids -- a locomotion-layer mismatch with implications beyond audio
(the audio config is an independent witness to the true clip numbering).
Verify via the AudioStateTrigger configs on the AnimationState watcher
(trigcfg dump exists) and cross-check the SetBodyAnimation clip table.
New diagnostics: [snh] SampleAndHold sends, [mix] mixer forwards with input
index + sum, [scalecfg] authored scale bindings/boundaries, [volset].
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
