Upon further analysis:
When multiples channels are used the topmost is always the channel assigned/selected to be controlled.
Does this not happen ?
Yes, channels 1, 2 3 & 4 act like that but once any REF channel is selected, it sits on top of the normal ones, no matter which one gets assigned/selected.
ASMOF, different REF channels also act as you said, that is, the selected REF channel sits on top of the other REF channels but they're all always on top of the normal channels. This is counterintuitive and not very useful I'm afraid
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