Lately, this has been a recurring question that I get asked. So, I thought I’ll blog it to clear up the misconception for audio enthusiasts.
In this case, Stereo and Mono refer to Stereo or Mono Tracks. Recording a Mono source onto a Stereo Track does not automatically make it “stereo”, nor does it serve any useful purpose. It will merely add to the file size and unnecessary processor loads. This will be the same as duplicating a mono track. Making program material stereo is a part of the Mixing Process in which, a stereo image is created and balanced. It is easier and a better practice to create a stereo image using mono channels.
To the contrary, if the content is from multiple sources (such as a choir, audience or room reverberation), then recording them with two or more mic sources into respective channels, would be the norm.