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CreateSoundBuffer error

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I copied this code pretty much straight from the source, with a few modifications, but for some reason the function keeps failing. The return value is consistantly E_INVALIDARG, but I don't see that many places I could be screwing up. Any ideas?
// set up the format data structure
	memset(&pcmwf, 0, sizeof(WAVEFORMATEX));

	pcmwf.wFormatTag	  = WAVE_FORMAT_PCM;  // pulse code modulation
	pcmwf.nChannels		  = 1;                // mono 
	pcmwf.nSamplesPerSec  = 11025;            // always this rate
	pcmwf.nBlockAlign	  = 1;                
	pcmwf.nAvgBytesPerSec = pcmwf.nSamplesPerSec * pcmwf.nBlockAlign;
	pcmwf.wBitsPerSample  = 8;
	pcmwf.cbSize		  = 0;

	// prepare to create sounds buffer
	dsbd.dwSize			= sizeof(DSBUFFERDESC);
	dsbd.dwBufferBytes	= child.cksize;
	dsbd.lpwfxFormat	= &pcmwf;
	// set rate and size in data structure
	rate  = wfmtx.nSamplesPerSec;
	size  = child.cksize;
	duration = size / pcmwf.nAvgBytesPerSec;

	HRESULT hr = lpds->CreateSoundBuffer(&dsbd, &temp_snd_buffer, NULL);

"lpds" is of type LPDIRECTSOUND8 and has been created previously.

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