CreatePosPassThru for multiple input pins

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C++

directshow

What should I use instead of CreatePosPassThru for multiple input pins?

STDMETHODIMP CTransformerOutputPin::NonDelegatingQueryInterface(REFIID riid, void **ppv)
{
    CheckPointer(ppv,E_POINTER);
    ValidateReadWritePtr(ppv,sizeof(PVOID));
    *ppv = NULL;
    if (riid == IID_IMediaPosition || riid == IID_IMediaSeeking) {
        // we should have an input pin by now
        if (m_pPosition == NULL) {
            HRESULT hr = CreatePosPassThru(
                             GetOwner(),
                             FALSE,
                             (IPin *)m_pAudioTransformerFilter->m_Arrinputpin[0],
                             &m_pPosition);
            if (FAILED(hr)) {
                return hr;
            }
        }
        return m_pPosition->QueryInterface(riid, ppv);
    } else {
        return CBaseOutputPin::NonDelegatingQueryInterface(riid, ppv);
    }
}

CreatePosPassThru: Creates a COM object that supports IMediaSeeking and IMediaPosition for single-input pin renderers and transform filters.

STDAPI CreatePosPassThru(
LPUNKNOWN pAgg,
BOOL bRenderer,
IPin *pPin,
IUnknown **ppPassThru);

When I had one input pin, everything was fine.
I have transformer filter with multiple inputs.

(Update)
It is actual.