I'm working on my first layout and am soldering feeder wires to several sections of track as I've seen is recommended. I will connect the feeder wires to a bus but wonder how to connect the bus to the EZ Command Controller. I could use the cord that came with a train set but I had wanted to use a longer and heavier gauge wire. I tried to use an audio plug from Radio Shack but ended up with a short, either because of my work or because the plug wasn't compatible. Help!