I have a question for OP.
I've been having a lot of fun playing with the matchless DC30 model on my axe fxIII for the past few days. I recorded a few long videos of myself playing at moderately loud volumes in my apartment, and here's one of them:
I'm curious if the sound in this video is close to your real matchless amp. I only played a matchless amp for a few hours (at low volume) almost 20 years ago, and even then, it was a Chieftain, not a DC.
So, I was curious.
*This thread is what got me interested in matchless amps at Fractal. (great sound..

)
https://forum.fractalaudio.com/threads/help-me-get-these-tones-matchless-and-bassman.215432/
*As I recall, the gain increase in the video proceeded in the following order:
1. Amp with saturation switch off
2. Saturation switch on (ideal)
3. Drive block on (Hard Fuzz)
4. Drive block
on (Heartpedal11)
thanks.