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AT3 is a sound format used in Persona 1 PSP. It was developed by Sony Computer Entertainment for the Sony PlayStation Portable. It is succeeded by AT9 on the PlayStation Vita.
Usage ranges from non-looping sound effects and voices to looping background music, however, this game uses AT3's for exclusively music. To make AT3's, you should use a sample rate of 44100 hz, with 16 bit depth audio.
Tools[edit]
AT3 Tools[edit]
Command line tools to make AT3's. You can download them here.
AT3 Workspace[edit]
Required to use AT3 Tools. Comes with .BAT files. Download AT3 Workspace here.