Whammy DT - noise problem
I've just received my first pedal - DigiTech Whammy DT. I connected it using the included power supply.
The chain is:
Guitar => Fender GT10 cable => (input) Whammy DT (output) => Line 6 Relay G10 Transmitter => Yamaha THR30II (battery powered, hi-gain channel)
As soon as I connect the pedal to an electrical outlet, before I even turn any effect on the pedal on, I can hear quite a loud noise.
The hum decreases (only a little bit) as soon as I touch the strings/knobs and increases when I touch (not even press) the "drop tune" button on the pedal (only this one, for some reason...)
Here you can find a recording showing the problem (comments included so that it's easier to understand what's happening): Soundcloud Link
Is this something normal, or do I have a faulty unit?
I should mention that if I connect my guitar directly to the amp, with the exact same settings (quite a lot of gain), I can barely hear any background noise, even with the noise gate turned off.