You'd probably need some type of input box (check out the M-Audio site), and a couple of cables. You could then hook the cables between the amps and the box, which, I think, should work out as being separate recording signals. As for drums, I think you'd be best off actually recording that separately.
Maybe this will put you on the right track, but, I have no idea whether or not this will work as I think it will, nor if it's the right solution for you.
Just throwing it out there. 🙂