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Enable Call Compression

This will let use keep a much longer archive on the SDR host. But trunk-recorder appears to keep old .wav files even after compressing them to .m4a. Refer to https://github.com/TrunkRecorder/trunk-recorder/blob/master/docs/CONFIGURE.md for config.json options

  • Add and test a cron job to delete .wav files that have a corresponding .m4a file
  • set 'compressWav' to 'true' (the default)