HK637-2 Train Sound Effects Generator IC

HK637-2 Train Sound Effects Generator IC.
This IC can produce 4 different Train sounds:
1. Train whistle + Train driving, Warning Bell and Train passing a bridge.
2. Train whistle.
3. Train warning bell.
4. Train passing a bridge.
It also has provision for LED indications.
The App Note shows how to set it up and how to modify the sounds. The IC comes in a DIP-16 package.