I'm no music expert but I'm gonna try to explain the best way I can. I just got done slamming a melody down on the keyboard & recorded it to a piano roll with a 120 tempo and it goes 8 bars. I changed my mind after and only want it to go 4 bars with a 60 tempo instead. I suck on the keyboard but I played this one exactly how I want it and don't want to have to re-record it or try to cut everything in half manually. So basically is there an easy way to cut a piano roll down by half but keep it the same with a slower tempo?