Just got home from the gig! The Mark sounded SO GOOD!
This was my bluegrass/country band, and I wondered if the Mark would be warm and smooth enough for this band (I have every confidence this amp will excel with my blues/rock band.)
settings
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The things I noticed:
-Articulation! Which I expected, but especially on the low notes on the E string (runs up to G.)
-Even volume across all frets and strings
-Dynamics! excellent control
-mid-forward grit, but balanced nicely with the band.
-the sound was so clear, I had to be extra careful with the clams!
So all in all a smashing success! I kept control of volume at the bass guitar’s volume pot, which was at about 5-6. So between the bass & amp, there’s plenty of volume on tap. Now I can’t wait to gig this bad boy in a rock n roll setting!

I think all I would do differently is turn off the VLE.
Thanks everyone for the feedback and support!