My guitar has a Fishman piezo loaded sadles which did not work with the G10 ie no sound. The electric pickups work ok. So I tried the adaptor, the Hosa GPP151 and also tried another different make of adaptor. Although I'm now getting sound from either, I'm also getting a loud buzz/hum coming through the amp which is not acceptable. I thought this might have been to do with my piezo so tried it with a friend's guitar which has a Graphtech piezo - but the same noise is coming through!! It sounds like it is picking up the noise from the power chip in the piezo but I'm not sure. Has anyone else experienced this? Line 6 - any suggestions?