Hi guys, really hoping you can help me here.

I've looked but can't find an answer to my problem.

When I wire up a piezo to a volume pot I get a buzz whenever the volume is around half way up,around 4 to 5

but when I turn it up full to 10 the buzzing just disappears, you would of thought that any buzzzing

would get louder the more you turned the volume.

I've tried 3 pots and 3 pickups on 2 different amps, same problem with all them, checked and double check the wiring diagrams and all solder joints...HELP!! please it's driving me mad!!