The 65001 is listed as an American steam, but steam engines had whistles, diesels had horns.
And these do have a digital interface and work on DCC
65001 American Steam Sound Unit
1: Whistle signal “crossing” (2 long,
1 short, 1 long blasts)
2: Brake sound
3: Bell
4: Conductor announcement: “All
aboard!”
5: Air pump
6: Coal shoveling
7: Not used
8: Sound off/on