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Field report: mic uplink dead on iOS, iPadOS and macOS alike, while Android on the same host works - so the host and the wire are fine. Two defects in the combined (voice-processing) engine, which became the default on all three Apple platforms a week ago and has never run on a device - CI only runs swift test on macOS, and the loopback test counts datagrams without decoding them. - The tap read the input format before the engine was prepared. Enabling voice processing swaps the engine's IO unit for the VPIO one and renegotiates its formats; until prepare() the input node can still report the pre-swap state, 0 Hz / 0 channels included, which installMicTap correctly refuses as 'no usable input device'. Both topologies now prepare first, so the chain is built against what the voice processor actually emits. - A mic chain that failed on the voice-processed engine took the whole uplink down for the session: that arm fell back to playback ONLY. The sibling failure a few lines above - the voice processor refusing to engage at all - already falls back to the split path, which is a working mic without echo cancellation. Both arms do that now. The mic outranks the AEC. Not reproduced locally (no Punktfunk entries in this Mac's log store, and collecting the device's log needs root), so this is a strong inference plus one proven logic defect rather than a confirmed fix. If it persists, Console filtered to subsystem io.unom.punktfunk / category audio names the stage: 'mic capture: N Hz' then 'audio engines joined' then, 10 s in, either 'mic uplink OK - peak ...' or the SILENCE warning. Follow-up worth doing separately: nothing reports whether the uplink actually opened, so the HUD offers a Mute Microphone button over a session sending nothing. Android gates that on a real micRunning signal.