hi.
i'm using FL studio 8 (PC audio/midi sequencer). in its piano roll, there is an option called (flip); to flip a melody horizontally (retrograde), or vertically (inversion), so far so good.

But the question is: there is an option under (retrograde) pointing to (preserve start times) which, as a result, doesn't provide an exact mirror of the original melody. So, is there two type of retrograde; with/without (preserving start times)?

P.S. the above 2 type- retrograde option is seen in many other sequencers too, like (Magix).