Mod: IHC 1255 special autopilot
Add in $ path to the sound file. I apologize.

<motorStartDuration>2500</motorStartDuration>
<attachSound file="$data/vehicles/steerable/deutz/attach.wav" pitchOffset="1" />
<motorStartSound file="$data/vehicles/steerable/deutz/agro620_start.wav" pitchOffset="1" volume="1.0" />
<motorSound file="$data/vehicles/steerable/deutz/agro620_idle.wav" pitchOffset="1" pitchScale="0.03" pitchMax="1.65" volume="1.0" />
<motorSoundRun file="$data/vehicles/steerable/deutz/agroL720run.wav" pitchOffset="0.5" pitchScale="0.02" pitchMax="1.05" volume="0.5" />
<motorStopSound file="$data/vehicles/steerable/deutz/agro620_out.wav" pitchOffset="1" />
<compressedAirSound file="$data/vehicles/steerable/deutz/compressedAir.wav" pitchOffset="1" volume="1.0"/>
<compressionSound file="$data/vehicles/steerable/deutz/compressorWork.wav" pitchOffset="1" volume="1.5"/>
<aiMotorSound file="$data/vehicles/steerable/deutz/agro720idleAI.wav" pitchOffset="1" radius="50" innerRadius="20" volume="1.25" />