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The KSEVENTSETID_AudioControlChange event set is used to notify clients when a miniport driver detects a hardware event, which is a change in a hardware volume-control knob, mute switch, or other type of manual control.
The event items in this set are specified as KSEVENT_AUDIO_CONTROL_CHANGE enumeration values.
The only event in this set is KSEVENT_CONTROL_CHANGE.