ISO 6969:2004 specifies the testing of sound signalling devices in accordance with ISO 512, to be carried out after mounting on the vehicle. This title may contain less than 24 pages of technical content.
You can specify the type of files you want, for your device.ISO 6969:2004, Road vehicles - Sound signalling devices - Tests after mounting on vehicle | ISO/TC 22/SC 3. Just read it with an open mind because none of us really know.