Am I missing something?

Got this app because I really enjoy touchpad but wanted numerical entry and musical notation seemed great. The numerical keyboard x button does not work as a backspace and the lack of a delete feature makes this irritating to use. For excel, navigational features or something like a mouse or 4-directional control on the same screen as the numbers would make this more functional. Also I could only get 2 of the screens to work, no musical notes, but perhaps this is because I tried it on a computer that does not have Sibelius on it.

licketysplice about NumPad., v3.2.1