Crashes when attempting to make a brstm with wav file that has 8 channels

[mkwiimaster7]

Im trying to make a brstm with 8 channels, but when i import the wav file used, it instantly crashes. here is the crash log:

Value does not fall within the expected range.
at BrawlLib.Platform.Win32.DirectSound.IDirectSound8.CreateSoundBuffer(DSBufferDesc& pcDSBufferDesc, IDirectSoundBuffer8& ppDSBuffer, IntPtr pUnkOuter)
at BrawlLib.Internal.Audio.wAudioBuffer..ctor(wAudioProvider parent, DSBufferDesc& desc)
at BrawlLib.Internal.Audio.wAudioProvider.CreateBuffer(IAudioStream target)
at BrawlLib.Internal.Windows.Forms.BrstmConverterDialog.LoadAudio(String path)
at BrawlLib.Internal.Windows.Forms.BrstmConverterDialog.OnShown(EventArgs e)
at System.Windows.Forms.Form.CallShownEvent()
at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
at System.Windows.Forms.Control.InvokeMarshaledCallbacks()