its not finding sd or mmc cards that is the issue. its finding the sd/mmc cartridge for the juicebox that is the issue. and although the juicebox mp3 kit ships with a sd card, the cartridge only uses the standard spi mmc interface, the lines needed to use the special sd features are not connected.
all the info to do the adapter has been posted already, just not pulled together in a single howto. the pinout for the interface has been posted, and the schematic for the sd/mmc cart has been posted, so all you need is a sd/mmc slot from something like a sd/mmc->usb adapter to make your own. if i get some time this weekend, i'll see about getting some notes together.
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