The mix level is a linear gain on the pad speaker port, 32768 being 0 dB.
A pad speaker port opens at 11626 (-9 dB). An unknown handle, a port of
another type and a level above 0 dB return the AudioOut error codes; a
negative level throws, as its effect is unknown.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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