Yo, I would like to play everything through my mixer (soundcraft notepad 102), including my computer. When I plug the outputs of the audio interface into the line inputs on my mixer, I can't get it so I can control the left and right monitor seprately, I can either get it in mono from both...
Be sure to check out the Studio Projects B1 (make sure it's the studio projects one and not behringer) which is really good for the price on acoustic guitar & vox.
To whoever is reading this looking for a good cheap pre, do not buy the Presonus TubePre, it is not worth it.
EDIT: I forgot to mention it does actually make a pretty good bass DI.
I haven't tried the B1 on an amp, so I can't say for sure but I don't think it will be great. You might want to try an alternative in that range like a MXL V67, again I can't say for sure, but the general consensus is that it does well on amps. But yeah with all those things you can get good...