To speed up your work in the Guitar Scientist Editor you can use a few keyboard shorcuts
The behaviour of the ESC button varies depending on the function you are using.
Selector, Root selector: Disable the function.
Squares, Lines: Cancel the insertion of a shape if you already selected the first point.
Poly-line: Breaks the polyline and lets you select the starting point of the next line.
Press CTRL + numbers from 1 to 8 to select a layer.
If you have some fret-markers selected, pressing the arrows will transpose the selected notes.