how to loop .at3 music file when choosing a game in XMB?

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I created a loop in Sound Forge, saved it in .wav format with the .at3 codec. Renamed the file to "SND0.AT3", and with the help of the HEX editor moved the string "smpl" to the beginning, but when me select a game on the PSP, the song plays only once.
what am I doing wrong? pls help

submitted by /u/exp0t
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