I just got a BSR 14/14xr 14 band equalizer from a pawn shop and love it. There's a channel button where you can activate the left or right channel by themselves or play both. On the display there is a light for each channel marked 'L' and 'R' that light up when each channel is activated. To the right of that, there is a light that says 'A = B' that stays on all the time. My question is, does the 'L = R' light mean that the equalizer is operating in mono? And if it is, how can i switch back and forth from mono to stereo? I've tried everything to get that light to change, but none of the buttons on the front do anything. I don't have the remote or user manual for it.