Right, that's where I've seen the Speaker switch, I haven't used a Countryman in years, most of the time it's either Radial or the passives my PA company employer gets made.
That musician was not the slightest bit interested in anything I had to say about tone; what the hell would I know I'm just the guy who critically listens to sound for a living, not the one who plays wooden mechanical instruments and is therefore an expert on pickups, impedance matching and guitar amps. I guess it actually sounded great, I was just too uneducated to know it. I used the term "like a piglet being stepped on" elsewhere, that's what I was thinking of when I said it.
Next time the mic on the amp will just be for show.