ST2110OutputAudioSenderAdvanced.frameBufferSize property

Number of audio frame buffers MTL keeps in flight for this sender — a count, not a byte size. At 4 ms ptime each slot is ~768 bytes (PCM16 stereo), so going larger is cheap and absorbs more PS-side pacing jitter. Defaults to 8 (32 ms cushion at 4 ms ptime); MTL’s minimum of 2 is too small for realtime PS sources, drains the ring on any pacing dip and causes MTL to skip an epoch.

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