muted sound play with non zero gain, even if set gain to zero

Hi
I consistently play sound source twice. First with 1.0 gain. Next with 0.0
gain. 
And I've got a problem. Second (muted) source is plaing several milliseconds
with full gain. 
I've listened short sound noise. This make "click" effect.
Help, how to solve the problem of "clicks".

OAL Version: From Summer 2009 : Version 2.0.7.0
OS: Windows XP
Sound device: any (software, hardware)

Source code:

ALboolean PlayStaticWaveFile( const char *filename )
{
	ALuint      uiSource;
	ALuint      uiBuffer;

	alGenBuffers(1, &uiBuffer);
	if(alGetError() != AL_NO_ERROR)
		return AL_FALSE;

	if(!ALFWLoadWaveToBuffer((char*)ALFWaddMediaPath(TEST_WAVE_FILE),
uiBuffer))
	{
		ALFWprintf("Failed to load or attach %s\n", ALFWaddMediaPath(filename));
		alDeleteBuffers(1, &uiBuffer);
		return AL_FALSE;
	}
    alGenSources(1, &uiSource);
	alSourcei(uiSource, AL_BUFFER, uiBuffer);
	if (alGetError() != AL_NO_ERROR)
		return AL_FALSE;

	ALFWprintf("Source played dry. Gain 1.0f\n");
	PlayDry(uiSource);
	alSourcef(uiSource, AL_GAIN, 0.0f);
	Sleep(2000);
	// !!!
	// Here listened some sound click. Seems like first milliseconds not muted,
even AL_GAIN set to zero.
	// !!!
	ALFWprintf("Source played dry. Gain 0.0f (But listened first milliseconds
of sound sample)\n");
	PlayDry(uiSource);
	alDeleteBuffers(1, &uiBuffer);
	alDeleteSources(1, &uiSource);
	return AL_TRUE;
}

Source code, release file and test sound sample attached;

http://old.nabble.com/file/p31106503/oal_soundclicks.zip oal_soundclicks.zip 

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