Tried that, it's the method Matt Schofield uses to dial in his amps.
I've addressed this already in this thread, but making fun of anyone proposing a different idea gets a lot more likes than having a conversation, so I understand you'll probably ignore it once more, but, if anyone else is interested...
It's just a better way to start. If you're used with the Fuzz Factory is useful to know the value for the input impedance should be 10k if it's first pedal that's actually on in the signal chain. If you set to auto, a lot of people have a compressor in the first spot and it will sound dramatically different because Helix will set the input impedance based on that, which would be 1M, and it would sound a lot brighter. The input impedance is a misunderstood feature, most would never look at it to solve the problem, and would try to tame it using EQ's probably... But it would be quickly solved, or at least close to it, if the person knew the proper value for the input impedance. Does anyone really disagree with this? I don't get it. Why should it be different the deep parameters? Yet again - I'm not saying this is the "best" value, just saying it's arguably a much better starting point.
BTW, I have very limited technical knowledge, but I could see the crossover distortion using a tone generator and a Oscilloscope VST when I turned the Bias down :) Way cool.