At9tool.exe <VALIDATED ✮>

| Bitrate | Quality | Use Case | |---------|---------|----------| | 32 kbps | Speech | Voice acting, low-bitrate streaming | | 64 kbps | Acceptable | Background ambience, low-fi effects | | 96 kbps | Good | Most game sound effects, some music | | 128 kbps | Very good | Music, cinematic dialogue | | 192 kbps | Excellent | High-fidelity music, surround sound | | 256+ kbps | Transparent | Archival, but overkill for gaming |

It is a Windows-native application. While it can run on Linux using Wine , it requires specific configurations. at9tool.exe

The tool is not commercially sold to the public. It is derived from the Sony PlayStation SDKs (Software Development Kits). Officially, licensed game developers receive these tools to compress audio assets for optimal performance on Sony hardware. Over time, through leaks and the open-source efforts of the modding community (particularly the ViTASDK project), versions of at9tool.exe have become widely available to the public. | Bitrate | Quality | Use Case |

Community translators and modders often need to replace in-game voice lines or music. If a game uses .at9 files, the modder must convert their custom English voice recording (a WAV file) into the .at9 format using at9tool.exe so the game engine can read it. It is derived from the Sony PlayStation SDKs

: While the core tool is command-line based, third-party wrappers like ATRACTool on GitHub provide a graphical user interface (GUI) to make it more accessible. Common Commands

Here is a simple Windows batch script to encode all .wav files in a folder to .at9 at 96 kbps: