I have two basses I want to use live. The output volume of each bass is different enough that I'd have to adjust my amp during the switch. Is there an A/B type box (other than the Behringer) that has a separate volume pot for each input?
MOrley Makes this Morley Pedals - Quad Box Routing/Switching. Lehle Makes the Lehle 3at1 SGoS RMI makes the Basswitch
+1 Radial has a number of switchers available at lots of feature and price points. I would recommend Lehle but my model lacks volume control.
Another vote for the Radial Bassbone. Here's a link. As you will see, they have other switchers as well, but I think the Bassbone is closest to what you want. Radial Products Index
The Bassbone is specifically designed for this application. That said an LS-2 would lend itself to such an application for much cheaper.
As few as possible. I'm more a "bass>cord>amp" kinda guy. Occasionally I'll goof with a pedal but nothing ever stays around long. If the DI also functions as a pre, bonus. My goal is to eventually eliminate the amp completely. The Bassbone sounds great, but it's $300.
If you want the DI functionality then something like the Radial or Basswitch or EBS MicroBassII would be a good (if pricey) option. The EBS (and maybe others) also has an effects loop so you can still run effects with it. They also have separate EQ/tone controls for each channel which can be really handy. If you don't need the DI or tone shaping then the abovementioned LS-2, Morley, Lehle and others are probably your thing.
Rip, in the classifieds I have a Radial for sale. It is like the bassbone but with extras. And I have it listed for $200.