The diagram below suggests how the soundcards can be installed with the BlueRail 5amp modules for large scale locomotives. The BlueRail module needs to be placed into BASIC mode using the orange link shown below. The BlueRail D1 terminal needs to be connected to the MyLocoSound F2 terminal and D2 to F1. The horn and bell buttons in the BlueRail app will then sound the MyLocoSound horn or whistle and operate the bell. Other sounds can be triggered automatically using the options available in the soundcards.