How to set up custom BGM in SC Evo and the 3rd Evo

Created on: 2026 July 26

In this guide you will learn how to apply custom BGM for the original OST DLC of Sora no Kiseki SC Evolution and Sora no Kiseki the 3rd Evolution.

This guide assumes multiple things:

  • You have modded PS Vita or PS TV
    • I have no idea if this works with Vita3K
  • The target game is installed on your Vita
  • The DLC with the original OST is installed on your Vita
  • You have Repatch Reloaded plugin installed
  • Ability to transfer files between Vita and your machine
  • Some mp3 or wav files with your custom music

What we are going to do is we will replace original OST DLC songs. Unfortunately, this guide does not work if you want to use Evo OST.

Furthermore, this guide only works with SC Evo and the 3rd Evo. As for the other three games (Sora FC Evo, Zero Evo, and Ao Evo) you probably need to tinker with internal files like data.psarc. This is outside the scope of this guide. Maybe someday I will make a guide for that too.

Sora SC Evo

1. Convert your mp3/wav files to at9

The first step of this guide is arguably the hardest part. In theory, there are several ways to convert mp3/wav files to at9 but, in reality, people seem to have varying success with them. In my case, the only method that works is the following web-browser utility. However, even this utility is not 100% reliable. All you do is upload your mp3/wav file and hit “convert” but sometimes this utility gives you files that weigh 0 bytes. These will not work! Make sure the converted file you download does not weigh 0 bytes. If it continues to give you such files, the only suggestion I have is to come back in a few hours and try again. I also have to say that I had more luck with MP3 files and with files that weigh less than more.

2. Download fan-patch and identify songs you want to replace

Next, we need to download this fan-patch. It contains OST and sounds of SC Evo and the 3rd Evo in at9 format. This might seem suspicious but I have tested these files myself and have not found any problems.

After finished downloading, extract and explore the contents of the folders. Take note that the folder that ends with 489 corresponds to SC Evo files and the folder that ends with 490 — to the 3rd Evo.

Now, go to this pastebin (SC Evo) and/or this pastebin (the 3rd Evo) and identify which songs you want to replace by checking song names.

For example, I want to replace Strepitoso Fight. In the Pastebin for SC Evo the file name for that is ed6420.at9. I grab the at9 file that I converted in Step 1. Let’s assume it’s called promise.at9. We rename it to ed6420.at9 and paste it in the bgm2 folder while overwriting.

Rinse and repeat if you have more than one song you want to replace.

3. Move the files to the Vita

  1. Open VitaShell, establish connection between your PC and Vita.
  2. Navigate to ux0.
  3. See if you can find reAddcont folder inside. If not, create it.
  4. Move PCSG00489 and/or PCSG00490 folders to reAddcont.

Now, in order to check it the whole procedure worked, you have to reach the point in the game where the song actually plays. If everything was done correctly, you will hear your new custom BGM instead of the original song.

Sora SC Evo Opening

Troubleshooting

Generally speaking, three things can happen.

First, you hear silence where the song that you replaced should play while the rest of BGM plays correctly. This means the mp3 or wav file was not converted properly in Step 1. Ensure one more time that it does not weigh 0 bytes. Try converting it again.

Second, the song was successfully replaced but the sound is too low compared to other songs in-game. This means you have to increase the volume of the song. There are free tools online but it might take some trial and error before you reach balanced sound.

Third, the original song is playing instead of your customg BGM. This usually indicates that the Repatch plugin is not working properly. I suggest you try two things: 1) completely re-install the plugin, try other versions of Repatch too, 2) completely delete PCSG00489 and PCSG00490 folders and their contents found inside reAddcont. If you don’t have anything else besides these two folders, delete the whole reAddcont folder. Create the folder structure again and move the files from PC to Vita again.

Sora the 3rd Evo

If you have any questions or comments, don’t hesitate contacting me at vackabox [at] icloud [dot] com.