How do I restore my DSi Sound recordings?

so I copied dsi sound from the nand to my sd card and launched it in twilight menu, but it said the save file was corrupted and replaced it with a new one, but i didn't realise it also wiped all of the dsi sound recordings from the nand..

i have a nand backup, so i thought i could get the recordings from the nand backup and have them on my pc, so i tried mounting the nand backup with ninfs, finding the dsi sound's private.sav and mounting that with osfmount, then getting the savedata1.bin and savedata2.bin, but now i'm lost as to what i can do with these savedata files because importing them as raw data in audacity does nothing, and mounting them with ninfs or osfmount does nothing.

is there any way i can get the recordings, or will i just have to restore the nand?