OK. Well thanks again for the tips on pg 2 here of how to set my PF800 for more useful tone.....it worked.
Had the comp from 9:00 to noon, Mids 2-3, Select knob @ #1. Now we got rained out, so instead of the outdoor stage out on the huge grassy lawn, we got moved inside. This is a med sized café type place, bout 20 tables, wooden building, wood floors. But was nice we kept the volume a lot lower than when outside.
I got lazy and just kept the TB153 cab loaded in car from Fridays gig, also used the P5 again. But this time the PF800 head with these suggested settings had a real nice tone that cut thru nice even at a much lower volume.
Actually, I liked that we were much lower in volume cause this gave the PF800 a real nice, n gooey lowend when I engaged the Ultra-lo button. Since I was quieter I could hear more of the nuances as I moved the bass, mid, treble, comp knobs just slightly +/- of where they were set to start. Worked out very nicely.
We're back at same place next Sat. Will be outside this time and I will try the GB NX 212T cab and maybe a active bass this time. As I now know better how to set this amp, I should be able to get more useful tone with this next combo of cab/bass and hopefully my other cab/bass combinations I use. Thanks again for the suggestions, very helpful and I look forward to trying this amp out at my next few gigs this month now. Peace y'all, ernie.