The command line ADXutil does output 44,1kHz and even handles ASF files. I wonder if it is possible to have jpcsp use decrypted wav files from outside the UMD image.
I managed to replace the ADX BGMs with wav ones in the AFS file and put it back onto the UMD image, but... jpcsp still tries to decode them as ADX files so there is no difference.
Oddly enough some of the wavs from the modified OD_STREAM.AFS file do play (same ones which played from the original AFS file in ADX format), but that's probably because those are small enough (like fanfares when you change class or win battle). Here is an INFO log (probably won't show anything new).
Maybe I should try using mp3 files and make all of them smaller than 1MB...
Edit: So I tested the mp3 files, but unlike the wav files thy are not played at all.
I managed to replace the ADX BGMs with wav ones in the AFS file and put it back onto the UMD image, but... jpcsp still tries to decode them as ADX files so there is no difference.
Oddly enough some of the wavs from the modified OD_STREAM.AFS file do play (same ones which played from the original AFS file in ADX format), but that's probably because those are small enough (like fanfares when you change class or win battle). Here is an INFO log (probably won't show anything new).
Maybe I should try using mp3 files and make all of them smaller than 1MB...
Edit: So I tested the mp3 files, but unlike the wav files thy are not played at all.