I just got a Godlyke PA-9, and it seems to be introducing a lot of noise into my signal. Basically, whether I'm using my entire pedalboard or just a single pedal, as soon as I plug in the PA-9, I get a lot of staticy humming coming through my amp. If I power the pedals with their original power supply or batteries, I do not get this noise. Has anyone else experienced this problem? I just want to make sure I'm not doing something wrong before I return it. Thanks!