`PUNKTFUNK_PAD_AUDIO_STAMPS` narrows `ensure` to a named subset of the seven
stamps (unset keeps all of them, so the shipping path is unchanged). The
MMDevices Properties ACL denies even an elevated `reg delete`, so the only way
to ask "which stamp breaks this endpoint" was to re-provision with subsets.
Using it settled that nothing does. Once the heap corruption is out of the way
and stamping completes in ONE pass, the full set yields an endpoint that is
4ch/48k/mask 0x33 with both directions open — render and the loopback capture
that feeds the 0xD1 plane — and `pad-endpoint tone` renders without error.
The intermediate reading, that the Steam driver was stereo-only and the feature
needed a different carrier, was a confounded A/B: the "stamped" sample had
accumulated its stamps across heap-corrupted runs. Asked properly — in
EXCLUSIVE mode, which reaches the driver instead of the engine's mix format —
that driver reports 2ch, 4ch and 8ch, the same shape a real DualSense reports.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
enricobuehlerandClaude Opus 5
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