the waveOutWrite() and waveOutUnPrepareHeader() functions. The latter is called

This means that the WAVEHDR struct passed to the waveOutWrite() function must be

allocated in unmanaged memory so it will survive after the call to waveOutWrite().

    if ((MMRESULT = waveOutWrite(waveDevice, waveHdrPtr, Marshal.SizeOf(waveHdr))) != MMSYSERR_NOERROR)

public static extern uint waveOutWrite(IntPtr hwo, ref WAVEHDR pwh, uint cbwh);

Declare Function waveOutWrite Lib "winmm.dll" (TODO) As TODO

[DllImport ("coredll.dll", EntryPoint="waveOutWrite", SetLastError=true)]

public static extern int waveOutWrite(IntPtr hwo, byte[] pwh, int cbwh);

[DllImport ("coredll.dll", EntryPoint="waveOutWrite", SetLastError=true)]

public static extern int waveOutWrite(IntPtr hwo, IntPtr lpHdr, int cbwh);

Declare Function waveOutWrite Lib "coredll.dll" (TODO) As TODO