Hello scooby263,
Thank you for posting on the Bose Community.
For audio tracks recorded in dual mono format, this allows the user to select which mono track they want to listen to. A dual mono recording could have completely different content in the left and right channels. For example, the Left track might be in English and the Right track in a different language. The selected track will be played through both right and left channels.
Hope this helps.
Kind Regards,
Joel - Community Support
Hello SyXbiT,
Thanks for the question.
I personally leave mine to the default setting of "Both."
It should have no bearing on the type of content you're listening to.
Kind Regards,
Joel - Community Support