Yeah!,
This is the trick, the voltage at pin 6 determine the maximun level, falling 30dB after the ten LEDs. Then if you got, for example, 1.228V reference in the first IC, the you need 1,378V (+1dB) in the second IC, and 1.546V (another +1dB) in the third IC. (if you know the LM3915 it is made with a resistor in the pin 8). Each LED in an 3915 is displaced 3dB, but it's displaced 1dB and 2 dB with respect to the others ICs, then a "wiring matrix" in the display, light the LEDs in the correct position. Believe me, it works !!!
Sincerely,
Victor