Should of mentioned that I've already done that but it makes absolutely no difference whatsoever which is why I find it so confusingNoise gate after amp block or/with Output 2 pad (be careful on clipping) . For Hum , Humbuster cable .
"The optional Boost/Pad function on Output 2 can be used to lower the noise floor. To find the right setting, adjust this to be as high as possible without clipping, as indicated by a red LED on the front panel meters. The volume won’t change but you should hear the AX8 s noise floor drop as you increase boost/pad."