XAudio2 - How come I am only able to play sound once with out reloading audio data?

// Populate and load IXAudio2SourceVoice// Play voice the 1st timevoice->Start( 0 );// Voice is done playing// Play voice the 2nd timevoice->Start( 0 ); // Nothing happens

#include "AudioPrecompile.h"#include "Audio.h"#include "Wave.h"//-------------------------------------------------------------------------------// Constructor//-------------------------------------------------------------------------------Audio::Audio(){	m_xAudio2 = NULL;	m_masteringVoice = NULL;}//-------------------------------------------------------------------------------// Destructor//-------------------------------------------------------------------------------Audio::~Audio(){	DeleteAllTracks();	SAFE_RELEASE(m_xAudio2);	SAFE_NULL( m_masteringVoice );	CoUninitialize();}//-------------------------------------------------------------------------------// Iterate through all tracks and free resources//-------------------------------------------------------------------------------void Audio::DeleteAllTracks(){	for( std::map< std::wstring, Track >::iterator i = m_tracks.begin(); i != m_tracks.end(); i++)	{		i->second.GetSourceVoice()->DestroyVoice();		//SAFE_DELETE_ARRAY( i->second.GetData() );	}}//-------------------------------------------------------------------------------// Set up XAudio2 Engine and parse audio card for Master Voice//-------------------------------------------------------------------------------HRESULT Audio::Initialize(){	HRESULT hr = S_OK;	// If we are using windows Initialize COM#ifndef _XBOX	CoInitializeEx(NULL, COINIT_MULTITHREADED);#endif	// Set up engine based of debug or release#ifdef NO_DEBUG	// Release	// Create standard instance of the XAudio2   	if( FAILED ( hr = XAudio2Create(&m_xAudio2, 0, XAUDIO2_DEFAULT_PROCESSOR) ) )		return hr;#else			// Debug	// Create debug instance of XAudio2 	if( FAILED ( hr = XAudio2Create(&m_xAudio2, XAUDIO2_DEBUG_ENGINE, XAUDIO2_DEFAULT_PROCESSOR) ) )		return hr;#endif	// Determine the number of audio devices 	UINT32 deviceCount; // Number of devices	m_xAudio2->GetDeviceCount(&deviceCount);	XAUDIO2_DEVICE_DETAILS deviceDetails;	// Structure to hold details about audio device	int preferredDevice = 0;				// Device to be used	// Loop through devices 	for (unsigned int i = 0; i < deviceCount; i++)	{		// Get device details		m_xAudio2->GetDeviceDetails(i,&deviceDetails);		// Check conditions ( default device )		if (deviceDetails.Role == DefaultCommunicationsDevice)		{			preferredDevice = i;			break;		}	}	// Create and configure a mastering voice using preferred device	if( FAILED ( hr = m_xAudio2->CreateMasteringVoice( &m_masteringVoice,														XAUDIO2_DEFAULT_CHANNELS,														XAUDIO2_DEFAULT_SAMPLERATE,														0,														preferredDevice,														NULL ) ) )		return hr;		return hr;}//-------------------------------------------------------------------------------// Load a RIFF wave file//-------------------------------------------------------------------------------HRESULT Audio::AddTrack( std::wstring path, std::wstring ID, bool loop ){	HRESULT hr = S_OK;	Wave wav;	// Create and clear a track	Track track;	ZeroMemory( &track, sizeof( Track ) );	// Use Wave object to open a .wav file	// This will fill out a WAVEFORMATEXTENSIBLE and XAUDIO2_BUFFER structure	if( FAILED( hr = wav.Open( path, track ) ) )		return hr;	// Create a voice using the WAVEFORMATEXTENSIBLE structure	IXAudio2SourceVoice * voice;	if( FAILED( hr = m_xAudio2->CreateSourceVoice( &voice,			// Pointer to source voice											(WAVEFORMATEX*)&track.m_waveformat,	// Pointer to wave data											0,									// Flags											XAUDIO2_DEFAULT_FREQ_RATIO			// Highest allowable frequency ratio											) ) )		return hr;	// Store the new voice in the track	track.SetSourceVoice( voice );	// Buffer to submit 	XAUDIO2_BUFFER buffer = {0};	// Determine if we are to loop this file	buffer.LoopCount = loop ? XAUDIO2_LOOP_INFINITE : 0;	//get a pointer to the SoundData's internal buffer	buffer.pAudioData     = track.m_sampleData;	buffer.AudioBytes     = track.m_size;	//no more audio data follows this	buffer.Flags          = XAUDIO2_END_OF_STREAM;	// Submit data to voice 	if( FAILED( hr = track.GetSourceVoice()->SubmitSourceBuffer( &buffer ) ) )		return  hr;	// Store are track	m_tracks[ID] = track;	return S_OK;}//-----------------------------------------------------------------------------// Perform per-frame update of audio//-----------------------------------------------------------------------------HRESULT Audio::UpdateAudio(){	//OutputDebugString(L"testestestest");	return S_OK;}//-------------------------------------------------------------------------------// Play source voice//-------------------------------------------------------------------------------HRESULT Audio::Play( std::wstring ID ){	HRESULT hr = S_OK;	//Starts consumption and processing of audio by the voice	if ( FAILED ( hr = m_tracks[ ID ].GetSourceVoice()->Start( 0 ) ) )		return hr;	return S_OK;}//-------------------------------------------------------------------------------// Stop source voice//-------------------------------------------------------------------------------HRESULT Audio::Stop( std::wstring ID ){	HRESULT hr = S_OK;	// Stops consumption and processing of audio by the voice	if ( FAILED ( hr = m_tracks[ ID ].GetSourceVoice()->Stop( 0, XAUDIO2_COMMIT_NOW ) ) )		return hr;	return S_OK;}