Song IO Reference
BtSongIO
— base class for song input and output
BtSongIONative
— class for song input and output in builtin native format
BtSongIONativeBZT
— class for song input and output in builtin native format
BtSongIONativeXML
— class for song input and output in builtin native format
BtSongIOBuzz
— class for song input in buzz bmx and bmw format