The issue about songs being unable to load is fixed now!
Finally added support for players to add their own songs
Sorry it took so long! I didn't have much time the past few weeks and what little time I had was spent on other things >.<
Right now, it only supports .wav and .ogg files. Not sure why Unity won't allow streaming of .mp3 files. If need be, you can find online sites to convert your files or use free software such as Audacity to do it.
Just add them to:
aVoiDance_[version]_Data > Streaming Assets