What options are out there for adding a steam chug sound?
Ideally it needs to be something mechanically triggered, like the old Lionel "Mighty Sound of Steam" systems.
I'd like to be able to fit two into a Lionel "starter set" style tender. One for each set of drivers in my kitbashed Mallet locomotive.
Then, when the lead drivers have that little wheelslip on startup, you'd get a cool "chugchug... chug... chug... chug..." effect