Acoustic guitar grounding buzz

[larry_emder]

I plugged 2 of my old man's acoustics into my pod today, just for giggles (both have undersaddle piezos).

Both of them had the same low frequency grounding noise when i plugged them in - the only way to stop the noise was to touch the metal part of the jack.

Why is this noise occuring? I'm pretty sure the guitars work fine, as i tried out 2 of them just to be sure, and he plugs them in regularily. This noise was not present when using my electric guitar plugged into the pod with the same cable.

[jeremy]

its a grounding issue in the guitar, probably right at the jack. when you touch the jack you are grounding it out which is why its quiet. see if there is a loose wire or almost loose wire in there some where