We present an editor that creates an interactive live preview for simple quadcopter missions. The preview provides instant feedback and the imperative script can be adapted through direct manipulation of the visualization. While the program is executed to draw the preview, it traces the source locations of all values. If a value is changed in the visualization, the change can be traced back to the source to produce the desired result. An application prototype demonstrates that our approach produces sensible and generalizing results even in the presence of control flow structures in our DSL.