I need to change the region code of Alpine

You don't need a region code for play audio or mp3 CD's. The region code comes into play because there are diff. & for displaying images.
For a CD player, its universal anywhere around the globe unless you have a radio FM/AM radio installed too. Even then local stations can be picked up according to their broadcast frequency.
Thus only a DVD Player gas region codes since options include a decoding algorithm so that it can be used, like PAL/SECAM, etc....sodeep