Upper portion:
1. CD
2. MP3
3. 6-disc (or is it double-DIN?)

Lower portion:
1. Cassette
2. minidisc


So we should be able to mix and match any upper and lower portion correct?

-Mr. Wigggles

I'd guess so.

Any info on how the MP3 player works? I guess its a CD MP3? in which case it'll play normal CD's too?

In Uk we get a 6 CD changer as standard, on CD's worth on mp3's is haerdly better.

Yes, the MP3 player will play regular CDs too.