I found "useful bass tones" (someone tells me what it means, please) with those settings, that I set up to create two almost identical-sounding channels:
I used my brand new AVII 1966 JB, with bridge pickup at 80%, neck pickup at 20% and the tone knob rolled off a bit.
I don't like cranking the bass knob on the amp all the way up, as the bass frequencies get out of control in a studio environment. I think 10 is the max level to have a booming bass sound (which I don't personally like, preferring more controlled and focused bass frequencies).