look at the bottom left corner of the taskbar that goes across the top of the screen, there is a quarter note there with an equal sign next to it...click that...it has bpm in it you can adjust there and it will change the play back speed...just make sure you do it when the cursor is at the beginning of the piece so that it does that speed for the whole thing, if you do it in the middle the speed will just change at wherever you set the tempo.