I got a Yamaha Magicstomp for Christmas, but someone had swiped the AC adapter from the box. So I just now got an adapter and tried to play. Well, the box turns on just fine but doesnt seem to be getting any input from the guitar. I get no sound through the amp with the effects on or off and the built in tuner seem to get no signal. Any clues? And yes, the input is plugged into the input and the output to the out!