Yes and nothe audio for the cars does change when certain upgrades are applied to the car, but not in the same way as it has been done previously.
In the past the audio samples were replaced when you applied upgrades to the car, but this time we are using real-time, in-game digital signal processing (DSP) effects to change the sound of the car when it is upgraded (apart from the turbo system, which also swaps the dump valve/waste gate samples based on turbo upgrades).
This suite of DSP effects is all-new to Forza Motorsport 4 and allows us to make sure that all the cars sound loud and exciting no matter what audio playback system you use. It also has the added benefit of allowing us to modify how the cars sound, as the player modifies the car in the game.
Almost all of the audio used in Forza Motorsport 4 has been created specifically for this game, so its a quite different audio experience compared to previous titles. As well as the DSP changes to the cars mentioned above, we have all-new sounds for tires, turbos, superchargers, electric motors, collisions, crowds, ambience, wind and many others. We also have a new way of creating and playing back LFE content so those with 5.1 systems or butt-kickers are in for a real treat.
For those without a subwoofer, we now have a selectable dedicated game mix for TV speakers in the audio options, so everyone select the mix that best suits their playback system.
