I’ve been looking into this for a while, and a simple attenuator will not do it without compromise.
Human hearing is non-linear so that attenuator need to have active EQ, IR and other tricks to get it to work right.
Then there’s the matter of feel; it needs to have a reactive load feature with reamping.
Only the boss Wazza amp expander has multiple reactive loads for different type of cabinets. The features blow my mind. Add built-in effects, midi recall, channel switching etc., just a great time to be a guitar player.
Then again I find myself moving towards a more practical pedal board setup. More practical and affordable, for my needs anyway.
I tell myself unless I write one whole album worth of neoclassical rock that I’d like to listen without cringing, I’m not going any deeper into this ever increasing bottomless pit. So far I’m safe!
The two notes new pedal sized CAB M looks like a viable solution along with one of those SD pedal board power amps, eliminate computer dependency.
But as Drew, says the Mark V 25 is a good option only because the newer amps don’t need to blow the roof off before they begin to sound good, I’ve heard similar reports of many newer amp designs.
About kempers and axe-fx, I had a kemper for years, as amazing as it was no way will I buy another monolithic computer-based unit at that price. The will not last half as long as analogue gear. Much prefer the feel of analogue drives and pedal board if it’s not a proper modern hot-rodded tube amp.