# Replay gain code

**URL:** https://community.mp3tag.de/t/replay-gain-code/42347
**Category:** Support
**Created:** [July 15, 2018, 12:14pm UTC](https://community.mp3tag.de/t/replay-gain-code/42347 "2018-07-15T12:14:25Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [July 15, 2018, 12:21pm UTC](https://community.mp3tag.de/t/replay-gain-code/42347/2 "2018-07-15T12:21:50Z")

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> [@sheepdisease](#):
>
> If so, what filter could I use to locate tracks which have been modified with this code and what code would I need to then undo it?

you can filter for any known field with  
%fieldname% PRESENT

You can also get an overview which tag fields are in your collection like this:  
Load all your files  
Select all your files  
Press Alt-T to open the extended tags dialogue.  
In this dialogue you see all fields that are present in any file.  
It would then be a good way to filter for these fields and see which files actually contain them. as probably not all files will feature the more exotic fields.

As far as I see it these actions replace a DB with dB.  
And if there is no such field, then no replacing should be possible.

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_[View the full topic](https://community.mp3tag.de/t/replay-gain-code/42347)._