# How to get an incremental letter
**URL:** https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970
**Category:** Support
**Created:** [June 6, 2024, 1:40pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970 "2024-06-06T13:40:34Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@cmach1](https://community.mp3tag.de/u/cmach1)
#### Post date: [June 6, 2024, 1:40pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/1 "2024-06-06T13:40:34Z")
I want to insert a lowercase letter as the fourth character in a list of filenames. I thought I put the right string in, but it just gives me the same letter (in this case 'a') over and over again. I want the letter to increase by one for each file. So track 2 should have a 'b', track 3 a 'c', ect.
This is what I used: A1.$char($add($num(%1,1),97)) %2
The lowercase letter comes after A1.
The 97 indicates the lowercase 'a', but what am I not doing right to get that letter to increase for each file?
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 6, 2024, 1:44pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/2 "2024-06-06T13:44:05Z")
> [@cmach1](#):
>
> A1.$char($add($num(%1,1),97)) %2
You could try it with
`A1.$char($add($num(%TRACK%,1),97))`
you should replace `%2` with the content of another tag like `%TITLE%` or `%ARTIST%`.
This would produce
`A1.b`
`A1.c`
`A1.d`
If you want to start with the lowercase letter `a`, you should start with the value 96 instead of 97.
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### Author:  [@cmach1](https://community.mp3tag.de/u/cmach1)
#### Post date: [June 6, 2024, 2:25pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/3 "2024-06-06T14:25:52Z")
It still gives me the same repeated character. Also I need to use %2 because it retains the remainder of the filename.
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### Author:  [@LyricsLover](https://community.mp3tag.de/u/LyricsLover)
#### Post date: [June 6, 2024, 2:28pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/4 "2024-06-06T14:28:09Z")
I can't help you further, unfortunately.
In my test, I load 3 tracks, choose Tag -\> Tag for \_FILENAME and use the above format string and it works as expected.
As said, I don't have your `%2` as I don't see how this could work and where the content should come from. But it does not repeat the same character. It start at `a` over `b` to `c` If I use 96 instead of 97.
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [June 6, 2024, 2:44pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/5 "2024-06-06T14:44:28Z")
You would have to supply the original filename, the pattern you used for the original filename and the pattern for the target filename.
If A1 is the %1 part, then $num(%1,1) will always return 0 as value.
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### Author:  [@cmach1](https://community.mp3tag.de/u/cmach1)
#### Post date: [June 6, 2024, 3:24pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/6 "2024-06-06T15:24:02Z")
> [@LyricsLover](#):
>
> I can't help you further, unfortunately.
>
> In my test, I load 3 tracks, choose Tag -\> Tag for \_FILENAME and use the above format string and it works as expected.
>
> As said, I don't have your `%2` as I don't see how this could work and where the content should come from. But it does not repeat the same character. It start at `a` over `b` to `c` If I use 96 instead of 97.
Okay, I see part of the problem. I wasn't doing it in Tag - Tag. I was doing it in Filename - Filename. The %1, %2 ect. values don't work in Tag - Tag, do they?
I should've mentioned which conversion section I was using. I used your code in Tag - Tag and added %TITLE% and got the result I needed. Thank you.
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### Author:  [@cmach1](https://community.mp3tag.de/u/cmach1)
#### Post date: [June 6, 2024, 3:30pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/7 "2024-06-06T15:30:37Z")
> [@ohrenkino](#):
>
> You would have to supply the original filename, the pattern you used for the original filename and the pattern for the target filename.
> If A1 is the %1 part, then $num(%1,1) will always return 0 as value.
The original filenames are:
A1 Computaform
A2 Computaform
A3 Computaform
A4 Computaform
But I wanted all of those files to start with A1. followed by an incremental letter. So they would end up like this:
A1.a Computaform
A1.b Computaform
A1.c Computaform
A1.d Computaform
So the "A1." was manually typed in by me. I just needed the rest of the string to make the lowercase letter adjust incrementally.
My issue was trying it in Filename - Filename, when I should've done it in Tag - Tag.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [July 6, 2024, 3:35pm UTC](https://community.mp3tag.de/t/how-to-get-an-incremental-letter/64970/9 "2024-07-06T15:35:22Z")
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