In the "Amp swap disappointment" thread, below, Ian has said that it's
possible to accurately measure the differences between each amp and, I would
assume, judge just what it is about one amp that might make it preferable to
another amp, to some listeners.

Would it therefore be possible for someone to take a "straight-line" amp -
and I'm happy to accept whatever you judge to be a representation of the
closest example of this - and then build an add on "filter" to alter its
sound to reproduce the sound quality of the Alchemist?

Then, maybe, a dozen or so other popular amps could be measured, and filters
built to represent each amp in turn.

Would I be able to hear the difference between the "straight-line" amp with
the Alchemist filter and the Alchemist amp?