[Bug 1703946] Re: Dedicated mono test sound is unavailable

[Ubuntu Foundations Team Bug Bot]

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https://bugs.launchpad.net/bugs/1703946

Title:
  Dedicated mono test sound is unavailable

Status in sound-theme-freedesktop package in Ubuntu:
  New

Bug description:
  When testing stereo speakers you get the "Front left" and "Front
  right" samples, but no such sample exists for mono speakers e.g.
  HSP/HFP bluetooth devices.

  Instead you get played the "audio-test-signal" which is white noise.
  To begin with I thought this was a problem with Bluetooth or the
  speaker itself, but it's just the sample being used.

  There is a bug upstream to provide this sample, but in the meantime I
  think playing the "audio-channel-front-center.oga" is a suitable
  standin.

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