I looked up 4076, google tells me its a quad d type flip flop.
I have various power rails in my setup, the meter is on the o/p driver chip supply, but I'll check for that when I get home tomoz.
One of mine is a piezo, another handy thing it has is a screwcap with a trimmer behind so you can set the loopvoltage bang on 2.5v when its in phase, a good nicety.
You know what they say, poo happens just get another.
The 4046, 'hc4046 has a tri state buffer on the Pc2 output, thats part of how it works, I'm going to test the thing on breadboard, I think with the chips enable input inactive it will be in high impedance, a tri state buffer is another good way as it regenerates the logic level, there is on the board some spare ways in a 4066 so I could use those.