waxychicken

Found the problem.
i didn't know you couldn't directcast a copy/clone.
you have to use the function
Device.DuplicateSoundBuffer(Source SoundBuffer, Destination SoundBuffer)
and had to go from SecondarySoundBuffer to just SoundBuffer as the type definitions.

I finaly got it to a point where i can get an error.

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll

Additional information: An item with the same key has already been added.

the error is at the "DIM The3DBuffer" line in this sub (complete code above.)

 Private Sub PlayStoredSoundBuffer(ByVal BufferIndexClone As SoundListDefinition, ByVal x As Double, ByVal y As Double, ByVal z As Double)
		Dim The3DBuffer As New SoundBuffer3D(BufferIndexClone.Buffer)
		The3DBuffer.Position = New Vector3(Convert.ToSingle(x), Convert.ToSingle(y), Convert.ToSingle(z))
		BufferIndexClone.Buffer.Play(0, PlayFlags.TerminateByDistance And PlayFlags.TerminateByPriority And PlayFlags.TerminateByTime)
		While BufferIndexClone.Buffer.Status = BufferStatus.Playing
			Application.DoEvents()
		End While
		'I thought that disposing things was perhaps the problem - maybe i was
		'cross-disposing items still in use. but that hasn't helped.
		The3DBuffer.Dispose()
		'BufferIndexClone.Buffer.Dispose()
		'BufferIndexClone = Nothing
	End Sub

i don't get it. it's in a new thread. why is there a conflict?
just because it's the same sound?

Note to self: before saying "OH! That looks good! I'll go try it!" first see if it's .NET compatible.

XAudio2 looks prety straight forward.
Thanks for the post, Dynamo, i think i'll switch and try that for a bit.
i already found more documentation for it.

Programming with DirectX : Sound in DirectX - XAudio2
http://programming4.us/multimedia/3830.aspx