Working with a studiolive 64s. Ran into an issue which seems like a firmware bug but maybe its a "feature". I had a subgroup routed to the center channel. I converted the subgroup to a post sends aux. After changing to an aux I found that the mix was still routed to the center channel but there was no way to change this. Once I converted back to a subgroup I could once again see/alter the mains routing. Changing to an aux and back to group wiped out the subgroup channel assigns. I believe changing from subgroup to aux should remove the mains routing to l/r and center especially since there is no way to change this until switching back to subgroup.
Am I missing why this would be intended behavior?