Hi,
I think I have very bad news for you Silmaryls.
The sound class Microsoft.DirectX.AudioVideoPlayback.Audio is not useable without the DX SDK.
The code is really really buggy as hell. That's not your fault, MS did that. [1]
The wave files are ok but the music function should be removed completely.
I found a ogg player code suite for C# that needs DX code to run. Maybe we could implement this? [2]
It's an urgent wish for me.
[1] http://www.codeproject.com/KB/directx/D ... yback.aspx
[2] http://www.codeplex.com/OggVorbisIntero ... mmits.aspx