... on very small screens. I seem to remember everything had to fit into 640x480 in the earliest days. I haven't been very consistent with the naming -- it's also called "pad bunching" in places which makes more sense. In the early days I referred to the trackpad as the Templot "drawing paper". Essentially it allows you to zoom in and see both ends of a long template at the same time, on a narrow screen, by bunching up the centre part of the grid into a narrow band: 2_152231_450000000.png This can be useful, for example when adjusting a transition curve. You might want to make adjustments at one end of the template, while watching the effect on the alignment at the far end, maybe 6ft away. The mouse action works in both directions simultaneously. Moving left to right controls the width of trackpad which is bunched up into the middle band. Moving the mouse up and down controls the amount of vertical shear in the band, so that both ends of an angled template can be on the screen. ...