My point, made early on, is that you can already do exactly what you described on the FC using layouts. What is your objection to that?
Austin
There are definitely workarounds that get a similar effect, but they arent exactly what Im describing or quite as effective. You would have to do separate layouts for lines 1&2, 2&3, 3&4 which would be using up the limited number of layouts you have and if you do the version that chris suggested, it wraps around so if you wanted to go from lines 1&2 to 3&4 and accidentally hit the button again, it would go back to 1&2 so youd have to cycle back which could throw things off in a live setting. Also being able to access the all of the looper functions, and effects on the fly would be much easier.
And finally, once again, it effectively doubles the number of layouts you have and its a software change vs. a physical hardware change. That alone should be enough of a positive to implement.