Do you know what kind of voltages the signal pin has when you turn the 5th channel knob? If it went under 2.5V and above it couldn't you use a transistor as a switch? Would hooking the signal pin to the base of a transistor then have the collector and emmiter inline with the positive pin and light work? I never checked out what was going on with the signal pin before so maybe that idea wouldn't work also. But I didn't know if lizrd56 wanted them to blink or just turn on or off.