That's a good idea. I could use that chip on my projects. Thanks AlphaBeta. Does anyone have experience with that chip regarding switching time and noise (cross-talk, offset, drift etc.)? I was about to suggest some mechanical relays. They're slow and could irritate your ears but they are physically the closest to having multiple wires hooked up to one input. On the other hand, arduino only has 10bit accuracy so a small (5mV) offset is ok.