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After some experimentation, it would seem that this wave of 2738 and envelope of 987 is trying to simulate the feeling of tarmac under the tyres. When the wheels lock up, this comes into play more forcefully as the tyres drag along the tarmac. This is what you feel as you lock the wheels. This makes sense with a wheelscale of 0.85. For the standard tarmac vibrations however, I think the intention may have been to use this, but at a much lower level, hence the unused line with wheelscale of 0.001:......................<!-- Hard Surfaces--><FFBSample name="tarmac" wave="2738" envelope="987" wheelScale="0.1" skid="1.25"/>I would recommend replacing the original line in your Autosport effects file with this one and try it out. To increase or reduce the texture of the tarmac coming through the wheel, alter the wheelscale parameter higher or lower to your preference. Hope this works for others like it worked for me!Ace.
<FFBSample name="gearChange" wave="1111199999" envelope="9876543210" channel="0" wheelScale = "0.3"/>