An unknown composer of the Gallant school. It was originally a violin sonata sonata in A minor, and then an unknown hand arranged it for organ and attributed it to Bach, the better for sales. This is why it sounds like nothing else by Bach, not even close, and also why it sounds so strange. That see-sawing fugue subject sounds absolutely normal on violin as the bow moves back and forth across the strings.
wow..That is quite a stretch and a new one on me..I'll stick with Bach. until proven otherwise.