Hi, I just receive a Zoom R8. Bought it used from Reverb, and was hoping to use it to demo out some song ideas. I am running into a couple audio-playback issues. First, there is no audio playback from the console itself (while in fact the LED screen shows audio coming through my guitar in input one). Second, after trying with headphones, I am getting playback, but very muddy, and only on the right side.