All three tracks ( 1 bass and two guitar) were done on channel 3 (extreme). The only change was I think the bass was in 45 watt mode and the guitars were 90. The bass could be louder.
Gain and treb were about 2:30 or 3:00. Bass around 9:00. I was using the sliders with a mild v. All the tracks were were corded direct from the line out on my hotplate, then with cabinet impulses in my daw.