Playback of recorded audio files

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This may be due to slight encoding difference between Firefox and Chrome. On some versions of Mac OS in particular, lacking some libraries may result in not being able to play files encoded by one of the browsers. If you Google "ogg on mac os", there are resources for dealing with situations like this. For example: https://mireth.com/resources/resources-d...t-ogg-mac/

Also, barring recording issues from participants' end, using a professional audio processing software program is the best bet. We recommend Audacity which is free: https://www.audacityteam.org/