Cableho is correct with the pad values,  the reason being in Gainmaker amps the forward and reverse signals are separated until the diplex filter unlike other SA amps (1,2,3) .
You will need to set the amp up with your refeence from the node on the main out which will have a 0 pad on the reverse input,  then pad aux 1 and 2 according to the internal coupler value.  If it is a dc 12 you may not be able to sweep off that  port of the amp but you will be able to sweep off the taps and next amp on that line. 
    
    Re: Gainmaker Reverse
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