Sequence Editor's accuracy is one tick (=pattern row). You can zoom in / out by changing the Step value, either from the menu, or by pressing Shift + and Shift -. This allows you to place your patterns with one-tick accuracy if needed. Mind you, if you offset the patterns by an uneven amount of ticks, they may disappear when you zoom out. However, they are still there. Also, you can use this tip to visualize more of you sequence on one screen by selecting higher steps (greater than 36 which is the default) - noolout