When the P38 Lightning is flying, it produces a single radial engine sound effect.
The radial engine has it's own distinct sound.
The P38 uses two water-cooled twelve cylinder (V12) engines with a complete different sound than the air-cooled radial engine.
William 'Bill' Kluggs: The War went on, and I didn't. They shipped soldiers east, and they shipped 'em west, but you'd have thought I had a long-term lease.