Registered users who are part of the 12-month upgrade plan can sign up for the beta on the Bitwig website.
An input that is electrically balanced. In this case, "balanced" refers to a type of AC electrical signal having two "legs" independent of ground. One is generally positive (+) and the other negative (-) in voltage and current flow with respect to ground. Unlike unbalanced audio lines there is no "signal" carried in the shield or ground connection unless there is a fault. The main benefit is that any noise that gets induced into the line will be common to both the positive and negative sides and thus canceled when it arrives at its destination, assuming the destination is balanced.