From my understanding the best and safest way is to set gain on amp all the way down plug in remote and turn the remote all the way up. Then use a multimeter (lots of tutorials on YouTube) if you don't have a dd1 and play a test tone on repeat and adjust the remote gain on the amp until you reach your desired voltage as derived from an equation that escapes me at the moment but should be in the video. This way you can't set your gains above where they should be and the remote knob will allow you to turn it down but not above where it should be
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