Dub lets people create and edit sounds quickly by using a graphic notation inspired by Morton Subotnick's "Making Music" software, which is simpler to understand and manipulate graphically than traditional music notation. A sound or sequence of notes is represented by a row of selectable dots. The length of the dot corresponds to the note's duration. The vertical position corresponds to the note's pitch.

Dub's User Interface leverages familiar editing skills in a new context by treating sounds as a sequence of notes and pauses, which can be entered with Graffiti or by tapping anywhere on the screen and dragging vertically to the desired pitch. Dragging the stylus in the bottom border highlights a sub-sequence, which may be cut, pasted, or copied as with a text editor. Unlike similar sound editing systems, Dub represents rests or pauses explicitly as white dots that can be selected and stretched like any other note.