Hi,
I encountered strange issue with Pocket Pod - I use it with Boss WL-50 wireless system. When any (or both) is powered with batteries, then it's ok. But when I take 9V power supply and connect both (Boss WL-50 has power out) to the same power supply then Pocket Pod generates ~10mV 2kHz sine buzz.
When Boss is connected to Fender Mustang Micro or Pocket Pod gets signal from Lekato wireless system, then all is fine