Just making sure I get this right.... Drive controls the gain, which effects the output volume. The Channel volume increases or decreases volume, but doesn't necessarily impact tone. The Master really acts like the power tubes, which also impacts volume, but really can impact tone. The Master KNOB - which is only an actual dial on the POD is the overall output volume leaving the unit for all patches. So if I want to make sure I have a solid signal, wouldn't I want to dime the channel volume and then use the drive and master to determine my tone/volume? If it ends up being too loud or not loud enough, I would then use the mixer. I was diming the master and then using the drive and volume to control the tone and final volume - like on a typical amp. If I wanted a cleaner sound, I should actually dime the channel volume first... Live, if I need to change volumes of a patch, I should use the mixer or the channel volume knob...if I use the master knob, that would change the output volume of EVERYTHING and not just the patch. Whew...lots to think about!