how to select a specific Output device for a sound played with directshow

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VS2008

C++

Visual-Studio

hello
i want to play many sounds simultaneously with Directshow. but first, i have to select for every sound a specific output device (i have many output devices ).
any idea about selecting devices before playing sounds , thanks . this is important parts of my program

#include <windows.h>
#include <mmsystem.h>
#include <streams.h>

#include <windows.h>
#include <mmsystem.h>
#include <streams.h>

class Mp3
{
private:
IBaseFilter * pif;
IGraphBuilder * pigb;
IMediaControl * pimc;
IMediaEventEx * pimex;

bool ready;

public:
Mp3();
~Mp3();

void Load(LPSTR filename);
void Cleanup();

void Play();
void Pause();
void Stop();
};


// MP3-Wav.cpp

#include "Mp3.h"


Mp3::Mp3()
{
pif = NULL;
pigb = NULL;
pimc = NULL;
pimex = NULL;

ready = false;

CoInitialize(NULL);
}

Mp3::~Mp3()
{
Cleanup();
}

void Mp3::Cleanup()
{
CoUninitialize();

if (pimc)
pimc->Stop();

if(pif)
{
pif->Release();
pif = NULL;
}

if(pigb)
{
pigb->Release();
pigb = NULL;
}

if(pimc)
{
pimc->Release();
pimc = NULL;
}

if(pimex)
{
pimex->Release();
pimex = NULL;
}
}

void Mp3::Load(LPSTR szFile)
{
WCHAR wFile[MAX_PATH];
MultiByteToWideChar(CP_ACP, 0, szFile, -1, wFile, MAX_PATH);

if (SUCCEEDED(CoCreateInstance( CLSID_FilterGraph,
NULL,
CLSCTX_INPROC_SERVER,
IID_IGraphBuilder,
(void **)&this->pigb)))
{
pigb->QueryInterface(IID_IMediaControl, (void **)&pimc);
pigb->QueryInterface(IID_IMediaEventEx, (void **)&pimex);

if (SUCCEEDED(pigb->RenderFile(wFile, NULL)))
{
ready = true;
}
}
}

void Mp3::Play()
{
if (ready)
{
pimc->Run();
}
}

void Mp3::Pause()
{
if (ready)
{
pimc->Pause();
}
}

void Mp3::Stop()
{
if (ready)
{
pimc->Stop();
}
}

int main ()
{
MP3 classmp3;
classmp3.play()
.
.
.
}