When initializing the amp block, Negative Feedback has the correct default value 2, but when double click on the knob in Axe III Edit, it reverted back to the previous/wrong default value 3.5.Axe-Fx III Firmware Release Notes
12.14
Improved Amp block Speaker Compression modeling. New algorithm is more accurate and sounds smoother with more “growl”.
Fixed incorrect default Negative Feedback for Deluxe Verb models (correct value is 2.00 if you want to update existing presets).
Fixed NaN when changing Drive block type if modifier is attached to Drive or Tone.
I hope it will translate to real cabs better than it is now.