[Request] Drakengard sfx sound format support

[Surihix]

The sound format used for sfx type sounds are in a different format which is different from .cads sound format used for the music and voice over sound files.
I randomly extracted a sub FPK archive file from the main IMAGE.BIN file of the game with my FPK extractor tool and got the files that were inside this FPK archive extracted.
The .bd file caught my attention and using PSound, I determined that this file has audio data in it. an quick goggle search led me to this xentax webpage:
http://wiki.xentax.com/index.php/PlayStation_2_BD_HD_Audio
And according to the above webpage, there is a .hd file or specifically a .hd2 file that also got extracted out of the FPK archive file. I suspect this hd2 file is definitely part of the bd file and could be the hd file that the webpage is indicating. I also found the size value (uint32) of the bd file at offset 0x04 of the hd2 file.

I have attached two sets of sample files as well as included a .lst file which contains path related strings for the hd2 and bd files along with other strings for the other files that were inside the FPK archive file:
hd2_bd_sample_1.zip
hd2_bd_sample_2.zip