# MP4/m4a CONDUCTOR field mapping

**URL:** https://community.mp3tag.de/t/mp4-m4a-conductor-field-mapping/71936
**Category:** Support
**Created:** [October 9, 2026, 8:35am UTC](https://community.mp3tag.de/t/mp4-m4a-conductor-field-mapping/71936 "2026-10-09T08:35:10Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![QuentinD](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/q/dbc845/32.png) [@QuentinD](https://community.mp3tag.de/u/QuentinD)
#### Post date: [October 9, 2026, 8:35am UTC](https://community.mp3tag.de/t/mp4-m4a-conductor-field-mapping/71936/1 "2026-10-09T08:35:10Z")

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Hi Florian & all,

I have an issue reading the CONDUCTOR tag from the m4a files in ProppFrexx. After investigation, it appears that mp3tag write the tag under the `©con` atom tag, while ProppFrexx reads `----:com.apple.iTunes:CONDUCTOR`. See [Meta Data TAGs - ProppFrexx ONAIR User-Forum](https://www.radio42.com/proppfrexx/forum/viewtopic.php?f=9&t=7&p=9)

Is there an option to configure mp3tag to map the CONDUCTOR tag to `----:com.apple.iTunes:CONDUCTOR` for m4a files?

Thanks

Quentin

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### Author: ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [October 10, 2026, 7:27am UTC](https://community.mp3tag.de/t/mp4-m4a-conductor-field-mapping/71936/2 "2026-10-10T07:27:35Z")

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> [@QuentinD](#):
>
> Is there an option to configure mp3tag to map the CONDUCTOR tag to `----:com.apple.iTunes:CONDUCTOR` for m4a files?

No, it's not possible to rewire the mapping of atom identifiers like `©con` for MP4.

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### Author: ![QuentinD](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/q/dbc845/32.png) [@QuentinD](https://community.mp3tag.de/u/QuentinD)
#### Post date: [October 10, 2026, 10:02am UTC](https://community.mp3tag.de/t/mp4-m4a-conductor-field-mapping/71936/3 "2026-10-10T10:02:28Z")

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Hi Florian,

Thanks for your reply.

If that option is not possible, do you have a solution to make ProppFrexx to be able to read the CONDUCTOR tag for m4a files?