I do not know many of the CF cards that work for sure with the MT, but so far, no one including me has reported any problems with the very good priced Sandisk Ultra II 8 GIG card used at any rate mode in the the MT deck.
One report of having trouble formating this card in MT and in a computer reader, but this seems an uncommon exception; maybe just a failed card, or some kind of system formating difficulty that might take some tenacity to get past.