Piezo hum with looper

[Gibby Fiddy Five]

When I try to use my ditto looper with a git with piezos the hum or buzz is hideous any body have a particular noisegate they use to cancel that racket? It's messing up my one man band mojo.

[Keith]

I have also found that using ground lifters on any three prong plugs will cure it sometimes.  I have often found that introducing recording devices into a PA or instrument loop can cause 60 cycle hum-ground loop- hum from hell.  Not smart enough to know why but I have experienced it. sometimes the ground lifter works, sometimes plugging the power for the pedal into a separate circuit, or use a hum eliminator (some think it robs tone, again not smart enough)  Power conditioner?  IDK but I feel your pain.

[Gibby Fiddy Five]

Thanks I'll try that stuff and also all battery power.

[Keith]

Then I have no clue and that is a familiar possession of mine

[John Sawyer]

Could it also be an impedance mismatch? Most of these pedals are built for a magnetic pickup...

[Gibby Fiddy Five]

Problem solved with battery powered amp,Fender mini mustang and 9 volt battery powering my ditto looper.

[Gibby Fiddy Five]

I like the little mustang a lot decent reverb should be a good little busking amp.

[John Sawyer]

Can you try one or the other on mains?  Should help narrow it down.