Instead of using keyswitches to swtich between H and V spans, i use controllers (Like CC23, CC24 etc....) Without percentages, it is impossible for me to know where horizontal or vertical patches change between one another....I now have to guess. I can see how this would be irrelevent if one is using keyswitches, or one of the automatic controllers (like speed), but for someone like me who uses Controllers, the percentages are extremely necessary.