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HLE AAC Decoder

During our reverse engineering efforts, it was found that Pokémon X/Y use AAC files for the music. So, to achieve feature parity between LLE & HLE audio, our developer B3N30 implemented an HLE AAC decoder. This makes Pokémon X/Y work at full speed, with audio, without using the slow LLE method.

This feature depends on AAC codecs which, unfortunately, due to patent issues, we cannot include in the builds. You can get these files by following the instructions below.

Please note that this method might not improve audio or performance for all games that started working on LLE.


  • Download the latest Citra build here.

  • If you are using Windows or macOS, you don’t need anything else. It will work directly.

  • If you are using Linux, you need to build Citra on your own.

    • Follow the Building for Linux guide.
    • You will need to install the following additional packages before building - libavcodec-dev & libfdk-aac-dev.
  • And you are done. Just boot up Citra, select HLE (fast) in the Audio tab and play.