I've been looking for a switcher with (at least) two ins and two outs so I can switch seamlessly between amps and basses. I've found the Carl Martin Route Box, but as far as I can tell, it's very simple - basically some switches and wires. Seems very expensive if that's the case ($150+ over here). The Lehle RMI Basswitch is probably able to do what I wan't, but it's way too expensive (considering it's capabilities are far beyond what I need). Ideally, I want something like the Carl Martin, possibly with a mute switch. Does it need buffers? Will I just have to build it myself, or does it already exist?