help on ripping idolmaster 2 ps3 songs files

[Makoto]

hi, hope someone can help me
the only audio for songs rippable seems to be the bgm, leaving vocals out.
I also tried a bms script i found, which converts from nub2 to ivag, but again only bgm works
here are samples
https://sta.sh/0sbp0kjjem4

[Makoto]

It's down to a decoding issue that nobody (evidently) has worked out.
Sources:
https://hcs64.com/mboard/forum.php?showthread=47878
https://github.com/losnoco/vgmstream/issues/407

thanks, i guess, i hope someone will be able to one day