Hi all, need help with a new stereo we just put in our car. It is a DVD/CD/MP3/Tuner set up from Sound Storm Labs Model SD632C. We live in New Zealand and this unit is from USA. We have hooked it up as per wiring diagram and all seems to "go" however the sound for the DVD/CD/MP3 functions sounds like it is in a "higher key" almost a little chipmunk like LOL. The radio is fine.... any ideas? Husband has checked that he has matched all power wires to the corresponding wires in wiring loom of car. He has plugged in wires to go to the amp & sub in the back of the unit, but hasn't actually put those in the car yet....could that affect it?