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How to Create Music Mods

A Tutorial for Animal Crossing: New Horizons

Updates

Update 2 13d
  • - Added list of K.K. Songs
Update 1 26d Addition
Hello! Sound mods in New Horizons are surprisingly simple once you have a game dump, but I might as well make this tutorial for anyone who would like to make their own. So let's get started!

1. Step 1: Requirements

Not much is required to start modding. All you need is:
  • A modded switch with atmosphere cfw
  • Animal Crossing New Horizons
  • NXDumptool

2. Step 2: Dumping the Game

2.1. Step 2.1: SD Setup

Our first step is getting the NXDumptool on our SD Card. Put the .nro file in the /switch folder on your SD card. If you have CFW on your SysNand, you can skip Step 1.2.

2.2. Step 2.2: Getting ACNH On EmuMMC

For anyone like myself who has EmuMMC CFW, the save data and games are seperated from the SysNand to prevent getting banned. Most people also have Incognito_RCM on their EmuNand so that they won't get banned from connecting to Nintendo's servers, which means you cannot download the game or updates on there. To start, you want to go into System Settings on your SysNand and then go to Data Management. Click on Move Data Between System / microSD Card, and then Move to microSD Card. You then want to make sure all of the data (updates or the eshop game itself) from New Horizons is on your SD card. (If you do not have much space on your sd card, move some stuff to the System memory or archive)
Shut down your switch, and put your SD card into your computer. Copy the /Nintendo folder and paste it over the Nintendo folder in /emuMMC/RAW1. Overwrite any files, this has no harm on your switch and will not get you banned. This will carry over any saves, games, updates, and DLC from the sysnand that was moved to the SD card over to the SD part of EmuMMC.

2.3. Step 2.3: Starting the Dump

Boot your switch into CFW and get ready to dump. This can take a long time as mine took almost 4 hours. Open the album or hold down R while starting the game to boot into the homebrew launcher. Click on the NXDumpTool. If you have a gamecard of ACNH, click Dump gamecard content. If you have a eShop version of ACNH, click Dump installed SD card/ eMMC content. Click on RomFS options, then once you are ready, click RomFS section data dump. This will dump everything to atmosphere/contents/01006F8002326000
You now have all of the moddable ACNH files on your SD Card.

3. Step 3: Music Mod Creation (bwav)

Music in New Horizons are stored as .bwav files. For the most part .bwav files are located in /Sound/Resource/Stream. There are 2 ways to get .bwav files. If you are trying to port music from another game, you can most likely find the track at smashcustommusic.net. If not, you will have to create it yourself.

3.1. Step 3.1: SmashCustomMusic

This step is very simple. Go to the smashcustommusic website and look for the game of your choice. For me I'm going to import the Animal Crossing New Leaf 8 AM into New Horizons just like I did with my New Leaf Mod. Once you find the song you want, download the .bwav format of the song.

3.2. Step 3.2: Creating your own .bwav

Sorry this segment of the tutorial took some time! We're gonna create our own .bwav now.
You will need 2 tools for creating your own:
This is a bit different from the tutorial by Extrasklep but I got it to work even easier.

3.2.1. Step 3.2.1: Converting your audio file

Your first step is to open up Looping Audio Converter and add your audio file to the box at the top. It can be a .wav, .mp3, etc. It does not matter. Go to output and select BFSTM. FOR KK SONGS: Check the box that says "Convert to mono." Click start to convert your file. Your file will be in the /output folder of Looping Audio Converter. Double click on the BFSTM file to open it in Citric Composer. It will automatically open Isabelle Sound Editor for the next step.

3.2.2. Step 3.2.2: Loop Points

This is probably the most irritating part of the tutorial. It's completely trial and error. If you song loops normally from start to end, then you should be good and can move on. If not, then you'll have to continue on. You can use the Green and Red sliders to make loop points for you song. The green segment is the beginning of the song that does not loop, it only plays once. The red slider is for the end of the song and the end of the loop. If your song doesn't have a fade out or a silent period at the end, you shouldn't have to change this.

You can play the song to listen for a good loop. Once you got it, proceed to the next step.

3.2.3. Step 3.2.3: Converting to .bwav

This is the last step for creating your .bwav. In the sound editor, go to File, then Export Binary. Save the file as a Binary Wave or .bwav. Just to make sure it works, open the file in Citric to make sure the loop is still there.

4. Step 4: .bars File Injection

Every music or sound file has a .bars file associated with it in /Sound/Resource. You will need to inject the custom .bwav file into the .bars file. For hourly songs, the .bars file is Bgm_Base.bars.
The best way to inject the .bwav into the .bars is to visit https://smashcustommusic.net/onlinetools/bars-patcher/. Make a backup of the original bars file from the game files and then put it on the website. Put the original .bwav file that you are replacing into the website and then the custom one you made or downloaded. Download the new .bars file and place it somewhere away from the normal one.

5. Step 5: Placing Files on SD Card to Test/Play

Make sure your .bwav file has the same name as the ingame file and place it in /atmosphere/contents/01006F8002326000/romfs/Sound/Resource/Stream.
Place your custom .bars file in
/atmosphere.../Sound/Resource
Always test it in-game.

6. Conclusion

That should do it for the tutorial. If I need to go a bit more in-depth or you have any questions, please leave a comment. Enjoy!

As pointed out by Extrasklep in the comments, the Bgm_Base.bars mentioned in this tutorial is also used for all K.K., Bgm_Demo, Bgm_Indoor songs and most likely every other song in the /Sound/Resource/Stream folder

7. List of all K.K. Songs (thanks to Extrasklep)

Agent K.K.       - BGM_Live_068_Keiji
Aloha K.K.       - BGM_Live_019_Aloha
Animal City      - BGM_Live_092_Town
Bubblegum K.K.   - BGM_Live_088_Idol
Café K.K.        - BGM_Live_050_Paris
Comrade K.K.     - BGM_Live_044_Showakayo
DJ K.K.          - BGM_Live_039_Eurobeat
Drivin'          - BGM_Live_093_Drive
Farewell         - BGM_Live_094_Sayonara
Forest Life      - BGM_Live_057_Morinoseikatsu
Go K.K. Rider    - BGM_Live_046_Kekerider
Hidden Song 1    - BGM_Live_901_Hazure01
Hidden Song 2    - BGM_Live_902_Hazure02
Hidden Song 3    - BGM_Live_903_Hazure03
Hypno K.K.       - BGM_Live_076_Utatanenoyume
I Love You       - BGM_Live_054_Daisuki
Imperial K.K.    - BGM_Live_023_China
King K.K.        - BGM_Live_062_Daimyo
K.K. Adventure   - BGM_Live_080_Hollywood
K.K. Aria        - BGM_Live_009_Maria
K.K. Ballad      - BGM_Live_043_Ballad
K.K. Bazaar      - BGM_Live_082_Roma
K.K. Birthday    - BGM_Live_091_Birthdaysong
K.K. Blues       - BGM_Live_032_Blues
K.K. Bossa       - BGM_Live_011_Bossa
K.K. Calypso     - BGM_Live_012_Caripso
K.K. Casbah      - BGM_Live_024_Turkey
K.K. Chorale     - BGM_Live_001_Sanbika
K.K. Condor      - BGM_Live_021_Peru
K.K. Country     - BGM_Live_041_Country
K.K. Cruisin'    - BGM_Live_035_Urban
K.K. D&B         - BGM_Live_037_Drumnbass
K.K. Dirge       - BGM_Live_047_Kowaiuta
K.K. Disco       - BGM_Live_090_Disco
K.K. Dixie       - BGM_Live_060_Dixie
K.K. Étude       - BGM_Live_007_Etude
K.K. Faire       - BGM_Live_018_Haisai
K.K. Flamenco    - BGM_Live_086_Flamenco
K.K. Folk        - BGM_Live_026_Minyo
K.K. Fusion      - BGM_Live_006_Fusion
K.K. Groove      - BGM_Live_084_Raregroove
K.K. Gumbo       - BGM_Live_030_Neworleans
K.K. House       - BGM_Live_074_House
K.K. Island      - BGM_Live_078_Doubutsunoshima
K.K. Jazz        - BGM_Live_005_Jazz
K.K. Jongara     - BGM_Live_085_Jongara
K.K. Lament      - BGM_Live_045_Enka
K.K. Love Song   - BGM_Live_036_Lovesong
K.K. Lullaby     - BGM_Live_008_Lullaby
K.K. Mambo       - BGM_Live_014_Mambo
K.K. Marathon    - BGM_Live_061_Gamelan
K.K. March       - BGM_Live_002_March
K.K. Mariachi    - BGM_Live_052_Senor
K.K. Metal       - BGM_Live_070_Metal
K.K. Milonga     - BGM_Live_083_Milonga
K.K. Moody       - BGM_Live_087_Bolero
K.K. Oasis       - BGM_Live_081_Maharaja
K.K. Parade      - BGM_Live_051_Parade
K.K. Ragtime     - BGM_Live_029_Ragtime
K.K. Rally       - BGM_Live_069_Ondo
K.K. Reggae      - BGM_Live_015_Reggae
K.K. Rockabilly  - BGM_Live_067_Kekebily
K.K. Rock        - BGM_Live_027_Rock
K.K. Safari      - BGM_Live_025_Afro
K.K. Salsa       - BGM_Live_013_Salsa
K.K. Samba       - BGM_Live_010_Samba
K.K. Ska         - BGM_Live_016_Ska
K.K. Sonata      - BGM_Live_075_Sonata
K.K. Song        - BGM_Live_053_Kekesong
K.K. Soul        - BGM_Live_034_Soul
K.K. Steppe      - BGM_Live_022_Cossack
K.K. Stroll      - BGM_Live_077_Osanpo
K.K. Swing       - BGM_Live_004_Swing
K.K. Synth       - BGM_Live_089_Electronica
K.K. Tango       - BGM_Live_017_Tango
K.K. Technopop   - BGM_Live_038_Technobeat
K.K. Waltz       - BGM_Live_003_Waltz
K.K. Western     - BGM_Live_048_Western
Lucky K.K.       - BGM_Live_020_Irish
Marine Song 2001 - BGM_Live_064_Hunauta2001
Mountain Song    - BGM_Live_063_Alpine
Mr. K.K.         - BGM_Live_049_Sensei
My Place         - BGM_Live_056_Bokunobasho
Neapolitan       - BGM_Live_065_Napolitan
Only Me          - BGM_Live_040_Onlyme
Pondering        - BGM_Live_059_Kangaechu
Rockin' K.K.     - BGM_Live_028_Rocknroll
Soulful K.K.     - BGM_Live_033_Gospel
Space K.K.       - BGM_Live_079_Minimal
Spring Blossoms  - BGM_Live_072_Harunokomorebi
Stale Cupcakes   - BGM_Live_071_Blueonigiri
Steep Hill       - BGM_Live_066_Nidanzaka
Surfin' K.K.     - BGM_Live_042_Eleki
The K. Funk      - BGM_Live_031_Funk
To the Edge      - BGM_Live_058_Naminami
Two Days Ago     - BGM_Live_055_Ototoi
Wandering        - BGM_Live_073_Horo
Welcome Horizons - BGM_Live_095_Minnaatsumare
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  • TronKitten avatar
    TronKitten Joined 1y ago
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    46 points Ranked 58130th
    access_time 11d edit 11d
    Does song length matter? I managed to do it but the song sounds gravel-y and it cuts off and loops from the beginning, not where I put the loop point which still shows up when I open it on my pc

    Edit: Nevermind I got it, I Was editing a KK song so I had to add the "new" .bars file as the base for each type of the song
    Bananite
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  • banjo avatar
    banjo Joined 4y ago
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    464 points Ranked 46872nd
    access_time 19d
    Okay, now I have another problem. I´ve downloaded some songs from smashcustommusic and replaced the original songs with them. But how can I know, which song from the original files are recommended to a specific bars. file?
    Bananite
    URL to post:
  • banjo avatar
    banjo Joined 4y ago
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    464 points Ranked 46872nd
    access_time 20d
    I´ve dumped my game without any problem. But after starting the game I got an error:

    A fatal error occured when running Amtosphére.
    Titel ID:     010041544d530000
    Error Desc:   std::abort() called (0xffe)
    Report saved to /atmosphere/fatal_errors/report_0000000032f98112.bin

    The problem only appears when I´m booting the game. Any idea how to solve this?
    Bananite
    URL to post:
  • PKT15 avatar
    PKT15 Joined 1y ago
    Offline
    access_time 23d edit 23d
    Hello ! :D I'm from spain, Thank u for that, but, I have a question for u, how I Know what file is the file what I want?,
    For example: I want to change Melody music of 05:00AM
    What file I need to change for that ? :/ I'm lost
    And, What is the original BWAV File ? ;(
    (I don't have BWAV Files on my switch folder ... Only .bars files
    Bananite
    URL to post:
  • atsuyasu avatar
    atsuyasu Joined 3mo ago
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    118 points Ranked 66520th
    access_time 27d
    did it!

    You can also make your own bwav this way!

    Bananite
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  • Anonymous456 avatar
    Anonymous456 Joined 4y ago
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    510 points Ranked 45953rd
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    access_time 27d
    And how do you convert .bwav to edit in Audacity?
    URL to post:
  • Extrasklep avatar
    Extrasklep Joined 2y ago
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    access_time 28d
    The Bgm_Base.bars file also has all of the K.K. music, BGM_Demo* files, BGM_Indoor* files and probably all the other files in /Sound/Resource/Stream/
    Owner of smashcustommusic.net
    URL to post:
  • access_time 28d
    Is there any way to mod the game to remove the music? I'd like to be able to just listen to the ambience and background noise.
    Bananite
    URL to post:

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Extrasklep
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Made original tutorial on GBATemp and made tool

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