It's an FMOD thing. Even though I had changed the track sounds to change with speed they would work, then break, then only the default track sounds would be heard. So there was no way to test the changes and in the game every tank track sounded like every other (m3 like a tiger, etc.). I must presume that when Hitech fixed the engines that it broke the tracks, so moving forward I may discover an issue with airplanes you just never know.