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copied!<p>I figured out you have to go through COM and CoCreateInstance(). Something like</p> <pre><code>#include <windows.h> #include <stdio.h> #include <XAudio2.h> int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) { WAVEFORMATEX format; format.wFormatTag = 1; format.nChannels = 1; format.nSamplesPerSec = 44100; format.nAvgBytesPerSec = 44100; format.nBlockAlign = 1; format.wBitsPerSample = 8; format.cbSize = 0; CoInitializeEx(NULL, COINIT_MULTITHREADED); IXAudio2* pXAudio2 = NULL; IXAudio2SourceVoice* source = NULL; IXAudio2MasteringVoice* master = NULL; HRESULT hr; if ( FAILED(hr = XAudio2Create( &pXAudio2, 0, XAUDIO2_DEFAULT_PROCESSOR ) ) ) { MessageBox(0, L"hi", L"hi", 0); } if ( FAILED(hr = pXAudio2->CreateMasteringVoice(&master ) ) ) { MessageBox(0, L"hi", L"hi", 0); } if ( FAILED(hr = pXAudio2->CreateSourceVoice(&source, &format) ) ) { MessageBox(0, L"hi", L"hi", 0); } char str[30]; float freq = 0.0; source->GetFrequencyRatio(&freq); sprintf(str, "%f", freq); MessageBoxA(0, str, str, 0); UINT32 OperationSetCounter = 0; UINT32 OperationID = UINT32(InterlockedIncrement(LPLONG(&OperationSetCounter))); if ( FAILED(hr = source->SetFrequencyRatio(1.1,OperationID ) ) ) { MessageBox(0, L"hi", L"hi", 0); } if ( FAILED(hr = pXAudio2->CommitChanges(OperationID ) ) ) { MessageBox(0, L"hi", L"hi", 0); } float freq2 = 0.0; source->GetFrequencyRatio(&freq2); sprintf(str, "%f", freq2); MessageBoxA(0, str, str, 0); Sleep(2000); float freq3 = 0.0; source->GetFrequencyRatio(&freq3); sprintf(str, "%f", freq3); if (freq3 != 1.0) { MessageBoxA(0, str, str, 0); } source->Start(0); return 0; } </code></pre>

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