If it's just a soundcard you're after then you don't need to worry about different bussboards.. there are several soundcards that work off the clockport on the A1200. I got a Melody1200Pro but there are others such as the more simple Melody1200 cards (Melody Base or Plus), Prelude1200 and Delfina (1200 or Flipper) for instance... All of these mentioned have AHI support and would most likely fitt nicely in a rack mounted case (most ofd the cards are splitted into mor then one card to fit inside a 1200 so you shouldn't have a hard time finding a place for them). :-)
