My 2 cents...
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The plus of amp knobs is the led indicator. If I had to improve the AX8 interface, I will delete ABCDE knobs, make amps knobs fully assegnable and add a dedicate menu navigation button.
How many people use these knobs?
I thought i was going to use them, but in reality they are not very practical for me. I do most of my tweaking with AX8Edit. Another issue is : i like to know the value of a parameter before i adjust it, so i could come back to it if i dont like the tweak. Also the sensitivity of the knobs could be adjustable for more predictable results.
Edit: sorry for the typo, it should say AMP control knobs in the poll