A clean-sheet layout: validity helpers at L1 to L4, then recording, battery and GPS in the order I use them. Plus a minimum-voltage readout that speaks punch-out sag while I am still flying.

Stacked thresholds that layer sirens, zero debounce against punch-out sag, an alarm that fires before the first telemetry frame arrives, and the link-quality warning I never wired up.

ELRS control-link antennas are linearly polarised, not circular like video. Why one horizontal and one vertical on a true diversity receiver beats a single antenna, and why my telemetry already measures it.

The callouts come from the stock EdgeTX voice pack, not from anything I recorded. What to scrub from a model YAML before publishing it, and the positional sensor-index trap that makes a shared config misbehave silently.

A miscalibrated voltage reading does not look broken, it looks plausible. Why report_cell_voltage makes a vbat_scale error propagate twice, and what the 3S-to-4S move does to your alarms.