Hi, I just realized that I have been exporting my mp3 files as joint stereo instead of mono (I was supposed to make them mono 
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If I recorded in mono is there any difference between exporting as a joint stereo vs mono, and is it noticeable?
Please let me know, if there’s a difference I’ll go back and export them again, thanks
If your Audacity tracks are all mono and you have not panned them left / right, then an exported MP3 will be mono regardless of the settings.
“Force to mono” will convert a stereo project to mono, but if the project is already mono then it doesn’t need to be converted because it’s already mono.
The “joint stereo” and “stereo” options are only relevant if the project is stereo.
Thank you! 