Well I have now put a 40106 in between pin 14 of the 4017 and the switch. It seems to work ok but still jumps switch presses a few times wondering if I should replace the 1uF with a 47uF to slow the voltage drop. On another point the output of the 4017 feeds a cd4052 Mux. Now when I measure voltages or highs across A and B each switch press gives the correct truth table for the 4052 but the video inputs via RCA onto x0, x1 and x3 don't output onto x. Is there anything else I need to do to display video output from x ??