# libSceCustomMusicCore technical debt

### Unknown function info

- [sceCustomMusicCoreBgmClose, sceCustomMusicCoreBgmOpen, sceCustomMusicCoreBgmOpen2, sceCustomMusicCoreBgmOutput, sceCustomMusicCoreBgmSetAudioVolume, sceCustomMusicCoreBgmStart, sceCustomMusicCoreBgmStop, sceCustomMusicCoreGetBgmAuthorityStatus, sceCustomMusicCoreGetHdcpStatus, sceCustomMusicCoreGetSystemAudioVolume, sceCustomMusicCorePostEvent, sceCustomMusicCoreSendEvent, sceCustomMusicCoreSendMulticastEvent, sceCustomMusicCoreSendSpMessage, sceCustomMusicCoreSetSystemAudioVolume, sceCustomMusicCoreStartOperation, sceCustomMusicCoreStartOperation2 and sceCustomMusicCoreStopOperation](../../../core/libs/prx/libSceCustomMusicCore/Export.cpp) (libSceCustomMusicCore) - names and NIDs are present in the [PS5 3.20 export inventory](https://github.com/DNNDHH/PS5-3.20_Libs/blob/b2a77c09cd71c01f34c790cfbe98c751a13262ad/libSceCustomMusicCore.c), but no credible prototypes were found. The declarations have no parameters solely to resolve known imports; this is not an ABI claim and callers must not call them until signatures are verified