There has been mass confusion on the GE 7FDL and GE FDL designations. From our research we have found that the prefix "7" lumps the engine into the GE category of large rotating machinery, the same prefix is used on their Generators and Alternators. The "7" prefix was not used until GE purchased the design from Cooper-Bessemer.” Of course different exhausts, body styles and other factors will cause engines to sound different.
This file contains 16 Airhorns accessible by changing CV48 values 0-15
| Key | Functions | Sound slots | Volume CVs | Volume values |
|---|
| F0 | Directional Headlights | | | |
| F1 | Bell | 4 | 283 | 99 |
| F2 | Playable Airhorn | 3 | 275 | 128 |
| F3 | Coupler Clank | 5 | 291 | 128 |
| F4 | Dynamic Brake | 6 | 299 | 128 |
| F5 | AUX3 output (pre-set to Mars Light) | | | |
| F6 | AUX1 + AUX2 (Ditch Light) | | | |
| F7 | Switching Mode | | | |
| F8 | Sound (On/Off) | 1 | 259 | 99 |
| F9 | Diesel Manual Notching (Up) | | | |
| F10 | Diesel Manual Notching (Down) | | | |
| F11 | Radiator (Fan) Sound | 8 | 315 | 128 |
| F12 | Dimmer (Headlights) | | | |
| F13 | Short Airhorn | 16 | 379 | 128 |
| F14 | Detector Sound | 9 | 323 | 128 |
| F15 | Crossing Communication | 10 | 331 | 128 |
| F16 | Rail Clank (works only if F8 is On) | 11 | 339 | 128 |
| F17 | Brake Set / Brake Release | 12 | 347 | 128 |
| F18 | Sanding Valve | 13 | 355 | 128 |
| F19 | Short Air Let Off | 14 | 363 | 128 |
| F20 | Compressor | 7 | 307 | 60 |
| F21 | Pop Valve Sound | 15 | 371 | 128 |
Make sure that index CV31 is set to 16 and index CV32 is set to 1 before changing a volume CV.