Yes, but there might be a hitch with a workaround. If you select and entire channel and try to amplify, it might not let you. Too big of a sample. The workaround is to select just a few seconds of the wav, amplify (I always go to just under zero, generally -0.01), then undo, select the entire wav, then Repeat Amplify. That'll work you around the limitation.
Still, I don't know how balanced this will make your recording. You'll be at zero on both channels, but the baseline will be different. It might be better just to amplify the lower channel to match the other, as best as possible. YMMV.