Alpine had an in dash mini disc player... made it about 3 years ago... forgot the model #, but they're hard to come by and are expensive.

Your alpine deck will not control a sony MD changer.

What you can do, if your alpine deck has the auxillary input option (if its new, it should) you can get the input adapter from crutchfield for $15, and use a sony controller for the MD changer... like the same controller/display you'd use if you were going to use an FM modulator. The controls will be seperate, but you'll get clean sound and still be able to keep the changer.

Call up crutchfield, and tell them thats what you want to do... dont let them talk you into something else (like buying a sony deck).