The title isn't entirely true actually. The 4 key inserts a left arrow. 1 and 3 do nothing, and 2 moves the beat selector down a note. The rest of the numpad either does nothing or act as their respective arrow keys. This is really annoying since the interface and rest of the program looks amazing, but I can't insert steps. Am I doing something really stupid wrong? Also, this happens with AND without numlock activated.
I think you need to actually use the top number row to place arrows.