Connect each output of the 4017 through an invertor of a 7404 hex inverter. You'll need two chips for 10 outputs. Better yet, connect each output to a 7486 X-OR gate. Connect the other inputs together and connect to a switch. Now, you can switch between the 'normal' effect and the modified one you want.want to invert it, so the sweeping section is actually the non-illuminated LED(s).
by Aaron Carman
by Jake Hertz
by Aaron Carman