Jpcsp uses a custom himdrender to communicate with the Sonic Stage codecs (openMG,SonyWavWriter), as for Sound Forge it costs money (no free version, so messing with it is out of the question) besides for that there is no known way to manually connect the codec pins so all files need to be loaded within the soundforge program making it difficult to save or playback the files (mono_atrac3+.exe just plays the file inside of soundforge and closes the file when its done).
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