+typedef MIXER_STATUS(*PMIXER_QUERY_KEY_VALUE)(
+ IN HANDLE hKey,
+ IN LPWSTR KeyName,
+ OUT PVOID * ResultBuffer,
+ OUT PULONG ResultLength,
+ OUT PULONG KeyType);
+
+typedef MIXER_STATUS(*PMIXER_OPEN_KEY)(
+ IN HANDLE hKey,
+ IN LPWSTR SubKey,
+ IN ULONG DesiredAccess,
+ OUT PHANDLE OutKey);