Capture system volume procedures with the example demo can refer to the following

CoreAudio2_Src\CoreAudioApi\AudioEndpointVolume.cs
..............\............\AudioEndpointVolumeCallback.cs
..............\............\AudioEndpointVolumeChannel.cs
..............\............\AudioEndpointVolumeChannels.cs
..............\............\AudioEndpointVolumeNotificationDelegate.cs
..............\............\AudioEndpointVolumeStepInformation.cs
..............\............\AudioEndPointVolumeVolumeRange.cs
..............\............\AudioMeterInformation.cs
..............\............\AudioMeterInformationChannels.cs
..............\............\AudioSessionControl.cs
..............\............\AudioSessionDisconnectReason.cs
..............\............\AudioSessionManager.cs
..............\............\AudioSessionState.cs
..............\............\AudioVolumeNotificationData.cs
..............\............\bin\Debug\CoreAudioApi.dll
..............\............\...\.....\CoreAudioApi.pdb
..............\............\CoreAudioApi.csproj
..............\............\CoreAudioApi.csproj.user
..............\............\EDataFlow.cs
..............\............\EDeviceState.cs
..............\............\EEndpointHardwareSupport.cs
..............\............\ERole.cs
..............\............\Interfaces\AUDIO_VOLUME_NOTIFICATION_DATA.cs
..............\............\..........\Blob.cs
..............\............\..........\CLSCTX.cs
..............\............\..........\eStgmAccess.cs
..............\............\..........\IAudioEndpointVolume.cs
..............\............\..........\IAudioEndpointVolumeCallback.cs
..............\............\..........\IAudioMeterInformation.cs
..............\............\..........\IAudioPeakMeter.cs
..............\............\..........\IAudioSessionControl2.cs
..............\............\..........\IAudioSessionEnumerator.cs
..............\............\..........\IAudioSessionEvents.cs
..............\............\..........\IAudioSessionManager2.cs
..............\............\..........\IMMDevice.cs
..............\............\..........\IMMDeviceCollection.cs
..............\............\..........\IMMDeviceEnumerator.cs
..............\............\..........\IMMEndpoint.cs
..............\............\..........\IPropertyStore.cs
..............\............\..........\ISimpleAudioVolume.cs
..............\............\MMDevice.cs
..............\............\MMDeviceCollection.cs
..............\............\MMDeviceEnumerator.cs
..............\............\obj\Debug\CoreAudioApi.csproj.FileListAbsolute.txt
..............\............\...\.....\CoreAudioApi.dll
..............\............\...\.....\CoreAudioApi.pdb
..............\............\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..............\............\PKEY.cs
..............\............\.roperties\AssemblyInfo.cs
..............\............\PropertyKey.cs
..............\............\PropertyStore.cs
..............\............\PropertyStoreProperty.cs
..............\............\PropVariant.cs
..............\............\SessionCollection.cs
..............\............\SimpleAudioVolume.cs
..............\.........Sample\CoreAudioConsoleTest\app.config
..............\...............\....................\bin\Debug\CoreAudioApi.dll
..............\...............\....................\...\.....\CoreAudioApi.pdb
..............\...............\....................\...\.....\CoreAudioConsoleTest.exe
..............\...............\....................\...\.....\CoreAudioConsoleTest.exe.config
..............\...............\....................\...\.....\CoreAudioConsoleTest.pdb
..............\...............\....................\CoreAudioConsoleTest.csproj
..............\...............\....................\obj\x86\Debug\CoreAudioConsoleTest.csproj.FileListAbsolute.txt
..............\...............\....................\...\...\.....\CoreAudioConsoleTest.exe
..............\...............\....................\...\...\.....\CoreAudioConsoleTest.pdb
..............\...............\....................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..............\...............\............

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