I can not seem to understand the relationship between gain, volume, preamp of the amp and guitar volume. I was told to crank up the volume on the bass to 85-90% of the maximum output because this where the bass is at default setting and you get the full effect of the pickups. 1. Do I crank up the volume to 8/10 of maximum output then adjust the gain to desired output with the bass volume at 85-90%, then tinker with the bass, mid treble of the amp, then tinker with the bass preamp? Or 2. Do I keep the volume at 20-50% and then crank up the gain to get desired output, with the bass volume at 85-90% then tinker with the bass, mid, treble of the amp, then finally tinker with the bass preamp? 3. In which order do most people adust? The amp`s volume, gain, amp`s preamp, then bass preamp? Thanks for all information and advice in advance.