itsik's got some good level references there!
especially for single coil setups.
again, depends on your guitar, and your personal ears/tastes...
if you favor higher gain, and humbuckers, you'll tweak the presence and treble to suit.....
that's where i am....
i have the presence on about 3 or 4, never higher...
but i'll pull the treble pull on vol 1, which adds that higher 'fender' type bite....
then i roll the bass down to 1...
then i use a slight "V" setting on my 5-band graphic (some 2b's have em, some don't)..... that's where i get my bass depth back for rolling it off on the bass knob.....
i like to run the lead drive around 6 or 7, for rhythm..... then use a boost or overdrive to push the front end when it's time to solo....
you'll find the VOL 1 to be very touchy...
between about 1.5 and 2, there's a huge volume jump, and this is quite typical of this model.
i use a weber mass to tame the output for recording at lower volumes.
i like the sound of my 2B the best thru a 2x12 closed back cab...
but it sounds awesome thru a 4x12 with greenbacks, and i actually use a single 1x12 with a greenback for recording only.
you can change the breakup characteristics of your boogie to suit, by simply changing the V1 preamp tube, to either earlier breakup, or higher headroom, depending on how much gain you're looking for...
if you're playing live, and don't have a whisper fan in the back, i'd get one installed.
also, depending on how old it is, and whether or not it's ever been 'tuned up', the caps WILL need replacing eventually...
i bought mine new in 1981, and just had it re-capped for the first time, this past month.
it DID make an improvement, both in the sound and the feel.
but it's amazing to me, after all the abuse and roadwork i put my boogie thru, that it was in such GOOD shape when we got inside of it....
and still worked perfectly, albeit a bit noisier and hissy because the caps had finally gotten out of spec.