Is there a way to limit the output volume of the 1/4 inch output in global settings? I have a Fender Rumble 500 that i would like to run my Helix LT through. the only issue is the Master volume isnt affected by the fx loop, so when i plug into the return of the amp, its full volume. i know i could turn down the big knob to match the output i want, im more worried about it getting bumped and hitting the amp (and my ears) with too much power. is there a global setting to limit the db of the 1/4 output as a safe guard?