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How to Create Music Mods - A Tutorial for Animal Crossing: New Horizons


Update 2 1y
  • - Added list of K.K. Songs
Update 1 1y 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 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 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
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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  • IC_ avatar
    IC_ Joined 4y ago
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  • pootie avatar
    pootie Joined 9mo ago
    I have modded a few songs already (all indoor) but now I want to include the "no hourly bgm" file. And I'm wondering how am I able to combine both that mod pack and my current set up, as we both have our own separate bgm_base.bars file. is it possible to add this to my current directory? 
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  • I followed this tutorial from scratch but my switch seems to be crashing everytime I'm trying to install a mod. Is it because i'm on SX OS? (I have a Mariko Switch)
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  • Tarpeing avatar
    Tarpeing Joined 10mo ago
    Hello! apologies if im barking at the wrong tree, new here.

    I'm very strongly considering modding my switch just for fixing the music in acnh as its driving me away from playing the game.

    I wanted to know if I'll still be able to update the game afterwards, or if I'll have to do some work around to fix the game back to its original state and then update and do it all over again.

    I understand the risks I'll be taking, only for switching music, I also just want to know how likely I am to get caught for this, because if its very likely I think ill just absolve from doing this.

    Thank you!
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  • Umbrilla avatar
    Umbrilla Joined 11mo ago
    120 points Ranked 73,641st
    Okay, so, whenever I try to use the BARS patcher, it tells me this: 

    "BARS patch error: Unable to find the original BWAV file in the BARS file."

    Please help me with this, because I don't understand what I'm doing wrong.
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  • WaffleRaccoon avatar
    WaffleRaccoon Joined 1y ago
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    I use SXOS. I dumped the files just like the instructions told me to. I got a song for Smash Custom Music that is BWAV. For some reason, the game files weren't where it was expected to be. The files were in my NXDumpTool Folder inside my Switch Folder. I then did the process of putting in the song but when I start up the game, the music hasn't changed. What's the problem?
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  • WaffleRaccoon avatar
    WaffleRaccoon Joined 1y ago
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    Oh boy! I can't wait to wait for 15 hours to dump the game! :D
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  • Cmod31 avatar
    Cmod31 Joined 1y ago
    182 points Ranked 64,227th
    Does this change the movement of K.K. while he is singing a custom song or how can i change that?
    Animal Crossing Modder
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  • ArminYTFD avatar
    ArminYTFD Joined 1y ago
    does the replacment bars file have to have the same name as the original one?
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  • TronKitten avatar
    TronKitten Joined 2y ago
    156 points Ranked 67,475th
    1y 1y
    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
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