It is best to open the tender and provide some pictures. Certain models are made in many road names over a course of several years and different electronics are provided. Some sound board are single stand alone, others are modular. The problem is generic or revised instruction can be posted on the web that doesn't necessarily apply to your engine.
Signal sounds behaves as described, but if this is the upgradeable version you can typically add Conventional RailSounds board and gain chuff and talk, but you need to add the chuff switch.
Lionel even made TMCC engines with only signal sounds. In those cases it is upgradeable to Command Railsounds.
The old Lionel Railsounds starter set where the hot item. They had RS and battery back up. Those tender would sell for $100 because folks want those tenders to use with more expensive sets that did not have sounds. Like the Army WWII set as an example that only had Signal Sounds. That is what I did. G
