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DirectShow can play two music file at the same time?

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DirectShow can play two music file at the same time? If I want to play two music file(mp3,wav) at the same time, whether I must create two instances of (m_pGB,m_pMS,m_pME,m_pBA)? Inidivial instance of (m_pGB,m_pMS,m_pME,m_pBA) plays its music file(mp3,wav). two instances of (m_pGB,m_pMS,m_pME,m_pBA) m_pGB1,m_pMS1,m_pME1,m_pBA1 for play mp3 m_pGB2,m_pMS2,m_pME2,m_pBA2 for play wav //above are original code,come from DirectX SDK IGraphBuilder *m_pGB; IMediaSeeking *m_pMS; IMediaControl *m_pMC; IMediaEventEx *m_pME; IBasicAudio *m_pBA; HRESULT CSoundManagerAdv::InitDirectShow(void) { HRESULT hr = S_OK; hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void **)&m_pGB); if (FAILED(hr)) return hr; if (FAILED(hr = m_pGB->QueryInterface(IID_IMediaControl, (void **)&m_pMC))) return hr; if (FAILED(hr = m_pGB->QueryInterface(IID_IMediaSeeking, (void **)&m_pMS))) return hr; if (FAILED(hr = m_pGB->QueryInterface(IID_IMediaEventEx, (void **)&m_pME))) return hr; if (FAILED(hr = m_pGB->QueryInterface(IID_IBasicAudio, (void **)&m_pBA))) return hr; return S_OK; }

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