So I just wrote an atrac3+ frame decode library (2013-06-03)

[Jeid3]

How to put it on Android? Or is only for Windows?

From Henrik: Add support for loading at3plusdecoder.so on Android. Make sure the .so files are at /PSP/libs/armeabi-v7a and/or /PSP/libs/armeabi on your Android external storage.

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Aaah yes I mean that at3plusdecoder.dll on the ppsspp folder

but that's the only thing I did and the result is sound stuttering in SRW AP

Of course if you have not 60 vps everytime, sound can not be great. Use Frameskip its will be better.