FlightGear C130 engine sustain source (GPL-2.0).
Credits: Emmanuel Baranger (Helijah), Didier Fabert and original C130 contributors.
Pinned upstream: https://github.com/FGMEMBERS/C130/tree/bbacb7a22c59932e19f4074e4b21232a0f53e727
The 48-second sustain adaptation is by DoctorSchnell / Codex.
Requires Python and NumPy. Extract, then run:
python tools/prepare_ac130_engine.py --root . --source-root .
Output: Assets/sounds/glide/loops/ac130_engine.wav.
