Nembrini Audio ADA MP1 plugin.

[Iperfungus]

I own "the real deal", the original "one and only" ADA MP-1, and I use the Nembrini MP-1 plug-in.
I know the preamp very well, since I had it in the past and I own it agan now, and I can say that the Nembrini captures MP-1 tone very well.
You can achieve MP-1ish guitar tones in easy ways and it's complete of everything that's needed: cabsim/IR loader, noise gate, effects, power amp simulation.
Nothing's missing.

To be honest, also the Nembrini JMP1 works very well (yes, I own an original Marshall JMP1 as well).

For who's interested in a free VST container, that allows to use plug-ins with no standalone interface without a DAW, have a look here:

https://www.cantabilesoftware.com/