+NTSTATUS
+WdmAudControlCloseMixer(
+ IN PDEVICE_OBJECT DeviceObject,
+ IN PIRP Irp,
+ IN PWDMAUD_DEVICE_INFO DeviceInfo,
+ IN PWDMAUD_CLIENT ClientInfo,
+ IN ULONG Index);
+
+VOID
+WdmAudCloseAllMixers(
+ IN PDEVICE_OBJECT DeviceObject,
+ IN PWDMAUD_CLIENT ClientInfo,
+ IN ULONG Index);
+