After hours of searching the net I have finally figured out a way to programmatically get and set the microphone gain (boost) value. The code mentioned below can be built on VS and does the job of setting gain value. #include "stdafx.h" #include <mmdeviceapi.h> #include <endpointvolume.h> #include <Functiondiscoverykeys_devpkey.h> #include "Audioclient.h" #include "comutil.h" #define EXIT_ON_ERROR(hres) if (FAILED(hres)) { goto Exit; } #define SAFE_RELEASE(punk) if ((punk) != NULL) { (punk)->Release(); (punk) = NULL; } HRESULT getMicrophoneBoostVolumeLevel(IMMDevice *pEndptDev, IAudioVolumeLevel** ppVolumeLevel) { HRESULT hr = S_OK; DataFlow flow; IDeviceTopology *pDeviceTopology = NULL; IConnector *pConnFrom = NULL; IConnector *pConnTo = NULL; IPart *pPartPrev = NULL; IPart *pPartNext = NULL; *ppVolumeLevel = NULL; wchar_t microphoneBoostName[] = L"Microphone Boost";//if your system