It is now possible to change the background colours of the Line Graph, Key, Multi Track and Track Windows as per the following images.

Note:
Background colours should be chosen to best match those of lines used. If a Red background is selected., Red lines on the graph will not be visible.

Standard Black Background

 Custom Colour Background

 Click on Display Menu, Options, Set Line Graph to Custom and click Custom Colour button to set background colour.

 Key & Multitrack Custom Background Colours

Right click on key/mutli track window and select Set Background Colour to set colour.
Right click on window and select Set Default Colour to return to normal colour.

 Mouse Track Custom Colour

Right click on mouse track window and select Set Background Colour to set colour.
Right click on window and select Set Default Colour to return to normal colour.