Hi , just purchased the 1824-c interfaces .. we are using Studio One pro 4 .. so the 1824-c and 2 headphones out in the front , why is it that when i engage the z button for low latency heaphone 2 cuts off ? headphone 1 works with either z on or off but headphone 2 only works with z off .. thank you does the interface only support 1 headphone at zero latency ? without using the outputs in the back ... thank you