I've tried to fiddle with TDF file to change material properties. Nothing seem to change anything.. Is it really true that in Race07 there's only one tarmac type available and it's always with default values? In other words, is TDF completely useless or is there way to edit it ( i might have incorrect syntax or something like that..)? If it's always default then why it's there in the first place? Would be nice to have clean and dusty tarmac instead of two dirt surfaces that you can't use on track because resistance and bumb size/amp are too high, they're BOTH only good for graveltraps.. Followup question: If you can change the values enough to be effective, the sound properties has to be edited too. How to do that? Can you replace that gravel sound with your own? That would be super... rFactor and GTR2 users can possibly help too, these games are so similar in many ways.. Most of the knowledge ATM i've learn from other titles anyway.