This is a thing I’ve noticed playing with the classic sounds on campaign, is that the idle sound of the warthog ins’t present. If anyone has used refinery and extracted audio from original CE maps, you would likely know that the warthog has 4 engine sounds; idle, low, med, and high. Low, med, and high play in various stages depending on the warthog’s speed. The idle sound plays when the warthog isn’t moving (obviously). However, using classic sounds on CE:A, I’ve noticed that the warthog, when stationary, doesn’t actually play its idle sound, and instead plays the “low” sound at a lower pitch.