The log read:
recorder: the second audio source is silent — recording the radio alone
recorder: no audio at all from "DAX Mic" after 3 s — nothing is streaming
Both true, and together they read as a fault while the recording was going
perfectly well — it was saved seconds later. On CW the mic channel legitimately
delivers nothing; the mixer already said what it was doing about it.
The watchdog now mentions the mic only when the radio is silent too, which is
the case where the recording really is empty.