I haven't seen the A,B & C buttons. My player is an RCA. I turned it around and found that where the speaker wires come into the backanother poor quality situation. The wires slide into holes that are exposed by pressing down/up on a lever. Each of the speaker wires were only in a fraction of what the wire was stripped back to. This allowed the wires, which were frayed, to touch each other. All I had to do was remove each wire, twist it tight, push the lever and re-insert the wire carefully pushing it all the way in. This fixed the volume in the BR somewhat. It is still lower but not as much. I also went into the menu of the player and fooled with the levels for the surround sound. I found the center chanel 20DB different than the rest and made it the same. One of these days, I'll take the speaker out and check the wire color and see if I can determine which chanel is in the BR.
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