Did you mean (for prebuilts): IAudioEndpointVolumeEx_GetChannelCount   IAudioEndpointVolumeEx_GetChannelVolumeLevel   IAudioEndpointVolumeEx_SetChannelVolumeLevel   IAudioEndpointVolumeEx_GetChannelVolumeLevelScalar   IAudioEndpointVolumeEx_SetChannelVolumeLevelScalar  

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