ARC Ref3 Bal-SE button..what for?


I was wondering what the BAL/SE button on the ARC Ref is for? I have my cdp connected to the balanced inputs but when I push the BAL/SE button on the Ref 3, I still hear music. Can someone please explain what this button is supposed to do?
128x128tboooe
The BAL/SE switch is NOT for the outputs, but specifically for optimizing the circuit to match your INPUT. The output selection is made automatically by the type of cables you have connected to your amplifier.
From the LS26 owners maual:

"BAL/SE: Select as appropriate for each input. For source components having balanced (XLR) connections to the LS26, select BAL. For single-ended (RCA) sources, select SE. Once selected for an input source, the setting is memorized."