# M4A Mode Descriptions Requested

**URL:** <https://community.mp3tag.de/t/m4a-mode-descriptions-requested/15187>\
**Category:** Support\
**Created:** [November 10, 2013, 4:58pm UTC](https://community.mp3tag.de/t/m4a-mode-descriptions-requested/15187 "2013-11-10T16:58:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![William](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/w/b19c9b/32.png) [@William](https://community.mp3tag.de/u/William)\
**Post date:** [November 10, 2013, 4:58pm UTC](https://community.mp3tag.de/t/m4a-mode-descriptions-requested/15187/1 "2013-11-10T16:58:16Z")

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When dealing with M4A files, the uses I usually see are Mode 1 & Mode 2.  
How do I interpret these?

I know M4A can handle up to 48 channels: is this related?  
I mean, does Mode 1 = mono & Mode 2 = stereo & so on up the scale?

I've googled til I'm blue in the face but I can't find a definitive answer.

The mode column for MP3 of course is mono, stereo, joint stereo, etc. but M4A is numerical, so what I'm looking for is a definition of the possible values.

Also: Does M4A have MP3 equivalents for both stereo and joint stereo?

Thanks in advance

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**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\
**Post date:** [February 9, 2026, 12:24pm UTC](https://community.mp3tag.de/t/m4a-mode-descriptions-requested/15187/2 "2026-02-09T12:24:45Z")

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Closed on February 9, 2026, 12:24pm UTC