Bug report (Ginetta GT4 engine sound problem)

Sorry if this is in the wrong place, please move it if it is.

Today, I set up a practice session + race, GT4 @ Hockenheim National, approx 25 AIs, cars from same class. I went out on track and did a bunch of laps, then returned to pit box. From there I went to race monitor and sat in on some other cars doing laps. I noticed that the Ginetta's engine sound was dropping out when they started braking for a corner, then cut back in about a second after they released the brake and applied the throttle. All I could hear during the corner was transmission and brake/tyre noise.

Let me know if you need more information.

Edit: I'm running the latest normal version (1.4.1.3).