To install make sure the files are in the correct folder and replace any lines related to motors in your sound xml with the following: <motor template="engineLarge" file="sounds/cat3406_loop.gls" volumeScale="2" linkNodeOffset="0 2 2.0"/> <motor template="indoorCabinRumble" /> <retarder file="sounds/turbo_loop.gls" linkNode="0>" innerRadius="23.0" outerRadius="90.0" pitchScale="1">> <volume indoor="0.5" outdoor="1" > </volume> <loopSynthesisRpm> <modifier type="MOTOR_LOAD" value="-0.00" modifiedValue="0.0" /> <modifier type="MOTOR_LOAD" value="0.00" modifiedValue="0.0" /> <modifier type="MOTOR_LOAD" value="0.25" modifiedValue="0.1" /> <modifier type="MOTOR_LOAD" value="0.70" modifiedValue="0.25" /> <modifier type="MOTOR_LOAD" value="1.00" modifiedValue="0.65" /> <modifier type="MOTOR_RPM_REAL" value="500" modifiedValue="0.50" /> <modifier type="MOTOR_RPM_REAL" value="1000" modifiedValue="1.0" /> </loopSynthesisRpm> <lowpassGain indoor="0.7" outdoor="1"/> </retarder>