Can prime mover sounds be converted? My recollection of what a GP-9 may actually have sounded like back in the day is hazy, but recently listened to a you-tube video of an HO GP-9 consist and at higher notches there was a bit of a whine that is not in the from the EMD 567-16 ULT. And, I seem to recall that there was some discussion here a while back about Ring doing a redo on the 567-16 ULT.