Hello - Right, so I spend a fair amount of time programming an Expression 3. I use a lot of macros, put effects on subs and trigger them with "Link to Macro", am on easy speaking terms with focus points, and even do most all of my programming on the rarely used but incredibly effective "Designer's Worksheet" (digitizing tablet, which nobody seems to use, ETC no longer sells, but which makes the board jump through hoops). All of this puffery is just preamble to me admitting that I really don't know why the heck there's a C/D fader. So far I've never found a use for it. What am I missing?