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    <p>For the master volume (for Vista and above), that would be:</p> <p><a href="http://msdn.microsoft.com/en-us/library/ms679141(VS.85).aspx" rel="noreferrer">ISimpleAudioVolume::SetMasterVolume</a></p> <p>As explained <a href="http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.mmedia/2007-01/msg00045.html" rel="noreferrer">here</a>, you may refer to the section:</p> <p><a href="http://msdn.microsoft.com/en-us/library/ms678710.aspx" rel="noreferrer">Core Audio APIs in Windows Vista</a> for more.</p> <p>This call is not a Media Foundation call but a WASAPI (Windows Audio Session API) call: ISimpleAudioVolume::SetMasterVolume (The SetMasterVolume method sets the master volume level for the audio session.)</p> <p>This may be difficult however to make the UI of the Media Center reflect the new sound level set by that call, as this <a href="http://discuss.mediacentersandbox.com/forums/thread/6758.aspx" rel="noreferrer">thread illustrates</a> it.</p> <p>For windows Xp, you can study this <a href="http://www.vbfrance.com/codes/AUGMENTER-BAISSER-VOLUME-WAVE-BALANCE_498.aspx" rel="noreferrer">script</a> and maybe <a href="http://www.tech-archive.net/Archive/VB/microsoft.public.vb.winapi/2005-07/msg00218.html" rel="noreferrer">this other script</a>.<br> <a href="http://www.codeproject.com/KB/audio-video/AudioLib.aspx" rel="noreferrer">Audio Library</a> might also be of interest.</p> <p>There is also this old <a href="http://www.codeguru.com/cpp/g-m/multimedia/article.php/c1575/" rel="noreferrer">Audio Project</a> which hasa master volume part:</p> <pre><code>BOOL CVolumeDlg::amdInitialize() { ASSERT(m_hMixer == NULL); // get the number of mixer devices present in the system m_nNumMixers = ::mixerGetNumDevs(); m_hMixer = NULL; ::ZeroMemory(&amp;m_mxcaps, sizeof(MIXERCAPS)); m_strDstLineName.Empty(); m_strVolumeControlName.Empty(); m_dwMinimum = 0; m_dwMaximum = 0; m_dwVolumeControlID = 0; // open the first mixer // A "mapper" for audio mixer devices does not currently exist. if (m_nNumMixers != 0) { if (::mixerOpen(&amp;m_hMixer, 0, reinterpret_cast&lt;DWORD&gt;(this-&gt;GetSafeHwnd()), NULL, MIXER_OBJECTF_MIXER | CALLBACK_WINDOW) != MMSYSERR_NOERROR) { return FALSE; } if (::mixerGetDevCaps(reinterpret_cast&lt;UINT&gt;(m_hMixer), &amp;m_mxcaps, sizeof(MIXERCAPS)) != MMSYSERR_NOERROR) { return FALSE; } } return TRUE; } BOOL CVolumeDlg::amdUninitialize() { BOOL bSucc = TRUE; if (m_hMixer != NULL) { bSucc = (::mixerClose(m_hMixer) == MMSYSERR_NOERROR); m_hMixer = NULL; } return bSucc; } BOOL CVolumeDlg::amdGetMasterVolumeControl() { if (m_hMixer == NULL) { return FALSE; } // get dwLineID MIXERLINE mxl; mxl.cbStruct = sizeof(MIXERLINE); mxl.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS; if (::mixerGetLineInfo(reinterpret_cast&lt;HMIXEROBJ&gt;(m_hMixer), &amp;mxl, MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE) != MMSYSERR_NOERROR) { return FALSE; } // get dwControlID MIXERCONTROL mxc; MIXERLINECONTROLS mxlc; mxlc.cbStruct = sizeof(MIXERLINECONTROLS); mxlc.dwLineID = mxl.dwLineID; mxlc.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME; mxlc.cControls = 1; mxlc.cbmxctrl = sizeof(MIXERCONTROL); mxlc.pamxctrl = &amp;mxc; if (::mixerGetLineControls(reinterpret_cast&lt;HMIXEROBJ&gt;(m_hMixer), &amp;mxlc, MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE) != MMSYSERR_NOERROR) { return FALSE; } // store dwControlID m_strDstLineName = mxl.szName; m_strVolumeControlName = mxc.szName; m_dwMinimum = mxc.Bounds.dwMinimum; m_dwMaximum = mxc.Bounds.dwMaximum; m_dwVolumeControlID = mxc.dwControlID; return TRUE; } BOOL CVolumeDlg::amdGetMasterVolumeValue(DWORD &amp;dwVal) const { if (m_hMixer == NULL) { return FALSE; } MIXERCONTROLDETAILS_UNSIGNED mxcdVolume; MIXERCONTROLDETAILS mxcd; mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS); mxcd.dwControlID = m_dwVolumeControlID; mxcd.cChannels = 1; mxcd.cMultipleItems = 0; mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED); mxcd.paDetails = &amp;mxcdVolume; if (::mixerGetControlDetails(reinterpret_cast&lt;HMIXEROBJ&gt;(m_hMixer), &amp;mxcd, MIXER_OBJECTF_HMIXER | MIXER_GETCONTROLDETAILSF_VALUE) != MMSYSERR_NOERROR) { return FALSE; } dwVal = mxcdVolume.dwValue; return TRUE; } BOOL CVolumeDlg::amdSetMasterVolumeValue(DWORD dwVal) const { if (m_hMixer == NULL) { return FALSE; } MIXERCONTROLDETAILS_UNSIGNED mxcdVolume = { dwVal }; MIXERCONTROLDETAILS mxcd; mxcd.cbStruct = sizeof(MIXERCONTROLDETAILS); mxcd.dwControlID = m_dwVolumeControlID; mxcd.cChannels = 1; mxcd.cMultipleItems = 0; mxcd.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED); mxcd.paDetails = &amp;mxcdVolume; if (::mixerSetControlDetails(reinterpret_cast&lt;HMIXEROBJ&gt;(m_hMixer), &amp;mxcd, MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE) != MMSYSERR_NOERROR) { return FALSE; } return TRUE; } </code></pre>
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    1. POChanging master volume level
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    1. COLooks like this is available only in vista, I need to be able to set the volume also in XP. Thanks for you answer anyway.
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    2. COI'm not sure if ISimpleAudioVolume is enough to adjust the master volume however, you may need to use IAudioEndpointVolume etc instead...
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