So I shot 6k red raw at 75 fps on a 25 fps timebase, to be able to use both normal speed and slow motion. 'Normal' speed at 100 percent gets me smooth 3x slow motion. But when I use 'custom' speed, Fcpx will not allow precisely 300%, but adds a digit, so it becomes e.g. 300,07%. Why is this, and is there a solution?