One digital piano I have has an Aux-Out L/+R and R connection (1/4 inch). I'm looking to use a 2i4 or UR242 interface. Would it be wise to use to 2 cables (balanced?) and connect to the 1 and 2 inputs of the interface, or is a single cable out from the L/+R output good enough? In this case I'm looking to record the sound coming out from the digital piano.
Or is it better to use the output from the headphone jack? I ask this because I have a second digital piano with just that output, no Aux Out.
Similar question on feeding a single back into the first digital piano. It has an Aux-In L/+R connection. With the interface connected to a computer and running Pianoteq, I'd like to output that from the interface into the digital piano at times. Similar question 2 cables? vs a single cable connected to the L/+R socket.