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Use this setting to control the values that MediaConvert puts in your HLS parent playlist to control how the client player selects which audio track to play. The other options for this setting determine the values that MediaConvert writes for the DEFAULT and AUTOSELECT attributes of the EXT-X-MEDIA entry for the audio variant. For more information about these attributes, see the Apple documentation article https://developer.apple.com/documentation/http_live_streaming/example_playlists_for_http_live_streaming/adding_alternate_media_to_a_playlist. Choose Alternate audio, auto select, default (ALTERNATE_AUDIO_AUTO_SELECT_DEFAULT) to set DEFAULT=YES and AUTOSELECT=YES. Choose this value for only one variant in your output group. Choose Alternate audio, auto select, not default (ALTERNATE_AUDIO_AUTO_SELECT) to set DEFAULT=NO and AUTOSELECT=YES. Choose Alternate Audio, Not Auto Select to set DEFAULT=NO and AUTOSELECT=NO. When you don't specify a value for this setting, MediaConvert defaults to Alternate audio, auto select, default. When there is more than one variant in your output group, you must explicitly choose a value for this setting.