opnsense-ports/audio/spectrogram/pkg-message
Franco Fichtner eed7de3a28 */*: sync with upstream
Taken from: FreeBSD
2016-12-28 12:42:23 +01:00

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The default sndiod configuration on FreeBSD already has monitor mode
enabled. To start spectrogram run
env AUDIODEVICE=snd/0.monitor spectrogram