My 1959 T-100D is set up like a typical two pickup Gibson. The two knobs closest to the pickups/neck are the volumes and the two closest to the lower bout are the tones. The ones on top vertically are for the neck pickup and the lower ones are the tones. Hope this helps.
Here's a photo: The volumes are the two on top with the tones on the bottom from this angle. Neck vol. and tone on left, bridge vol. and tone on right.