[Bimmer]

After some experimentation, I've narrowed the problem down to the Wright-Cyclone and Pratt & Whitney R-Series .prs files. I still haven't sorted out exactly what's going on, but there is some sort of issue with these files that is causing sounds to drop.

With the Dive Mod v2.1 files installed, I get back sounds for the Wright-Cyclone engined planes, but the A-20 and B-25 sounds still drop out above 2000rpm.