ok just got home and tested. the following primarily has to do with "soft reset" of an amp block (selecting another type then back to the one you want) and the choice of Authentic or Ideal for the Tone Control Display settings (Hardware, Setup>Global). i use the word "page" below but could also say "tab" for the different pages/tabs we click in the Amp block for different sections:
on TONE page in Axe-Edit in the Amp block
Tone Control Display settings:
Authentic: Bass Mid Treble DO go to default (5) on Amp Type change
Ideal: Bass Mid Treble do NOT go to default on Amp Type change
for either option, Gain and Level do NOT change to default when changing amp types.
(this has lead to some suddenly loud sounds when changing from an amp set to +10 dB Level to another amp which starts out very loud. i always change the Amp Level to -40 or so before changing amp types.)
Balance, Input Select, Bypass mode, Bypass and Scene Ignore also do NOT change to default.
for either option, things like Input Trim, Presence, Depth, Master Volume, Channel MV, and Global MV, and any switches that appear in authentic, like Fat, Bright, Presence Shift
DO change to defaults when changing amp types.
on AUTHENTIC page in Edit, all additional controls that show up now (so not including what was on the Tone/Authentic page before) DO change back to default settings when changing amp types, regardless of Ideal or Authentic Tone Control Display choice.
the conclusions from the following pages are excluding the common parameters that appear on every page: Level, Balance, Input Select, Bypass Mode, Bypass and Scene Ignore.
on PREAMP page, all parameters DO change to defaults EXCEPT Boost Type and Boost Level, regardless of Ideal or Authentic Tone Control Display choice.
on POWER AMP page, all parameters DO change to defaults EXCEPT NFB Compensation regardless of Ideal or Authentic Tone Control Display choice.
this may explain some of the recent "NFB should have been on" threads/questions when the parameter was introduced recently. if they stayed in the same amp block and turned off NFB Comp, then changed types/models, the volume could have been different than expected due to this staying off. if they happened to do a Hard Reset though, NFB Comp would have turned back on.
on PWR TUBES + CF page, all parameters DO change to defaults EXCEPT Bias Tremolo Frequency, regardless of Ideal or Authentic Tone Control Display choice.
on POWER SUPPLY page, all parameters DO change to defaults, regardless of Ideal or Authentic Tone Control Display choice.
on SPEAKER page, all parameters DO change to defaults EXCEPT Auto Dyna Cab Imp, Speaker Breakup, Speaker Compression, Speaker Time Const, Output mode, regardless of Ideal or Authentic Tone Control Display choice.
on INPUT EQ page, all parameters DO change to defaults EXCEPT Type and Q, regardless of Ideal or Authentic Tone Control Display choice.
on OUTPUT EQ page, all parameters DO change to defaults EXCEPT Off/On switch, regardless of Ideal or Authentic Tone Control Display choice.
on DYNAMICS page, all parameters DO change to defaults EXCEPT Out Comp Type, regardless of Ideal or Authentic Tone Control Display choice.
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also discovered that Command+U on a mac changes a block to a Shunt.
i streamed this and it took about an hour to go through all this testing, so i have a recording if we need to
prove this or something LOL.