| A little more info for you.
Since the RH450 preamp is solid state, you don't use the gain control for tonal purposes (like tube grind). So, here is how you optimally set the amp:
1) Set the pre gain knob just below the clip light coming on at your hardest, lowest playing level. The best way to do this is to turn the master down so you don't blow you ears out, then play as hard as you ever would on your open E while adjusting the gain knob to just below the clip light coming on. That light should NEVER come on (i.e., you want a clean but still relatively hot signal going into the pre), so you might have to turn it down just a touch more once you are on the gig, since we all play a little harder than at home when the adrenaline starts pumping.
2) Set your EQ, tubetone, compression, etc. to the level that sounds good to you on your primary preset (the one you will use most often). When you have the tone and effects right, then set the 'post gain' volume (i.e., the tubetone knob in shift mode) to noon.
3) Store that setting. That is your main 'default' amp setting.
4) If you have multiple basses, do the same thing.. setting the pregain optimally, then EQ.
5) THEN, adjust the post gain setting for bass number 2 (or EQ setting number 2 if you only use one bass) so that the volume of your main preset and the second preset is the same at a given master volume setting.
6) Store that preset and continue.
This will result in the master volume taper being quite smooth and even, and all your presets being the same volume with either different tone settings or different basses. Of course, you might not want them the same volume... another cool use of the presets is to set two presets identically EXCEPT for the post gain shift mode volume. This results in you having a normal and 'boost' preset for soloing, with the only difference being the overall volume... and you don't have to touch the master.
Hope that makes sense.. there is a LOT of power in those presets and controls! | 
