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The tool may be started with either '-o <file-path>' to record or with
'-i <file-path>', where file-path is an existing .WAV file, to
playback audio. Audio output devices may be listed with the '-O'
option and selected by index number using the '-P <device-index>'
option. No format conversions are done for playback by the tool so the
output device must support the format of the input .WAV file. The
playback duration is the duration of the input .WAV file.
The tool '-s <start-second-in-minute>' option is now optional, without
it recording or playback starts immediately. So to playback a .WAV
file:
$ record_time_signal -i wwv.wav
To play back the same file stating at second 55 in the minute:
$ record_time_signal -i wwv.wav -s 55
Use the '-h' option for more help.