I'm pretty sure that's the way it's supposed to work.. According to the manual "The feedback delay length is the length of either Delay A or Delay B, whichever is longer. " so if delay A was 1/16, and delay B is 1/2, you would get feedback 'loop' of 1/2 note duration. Within each 1/2 note feedback 'loop' there would be delay A 1/16 note in, and delay B 1/2 note in, or at the end (which due to the loop is also the beginning). So it would sound like a staggered delay.