korg esx1 question

since i cant find an sp12,
i was loading sp12 samples to the esx1 from the memory card. ( i tried both wav and aiff files). for some reason i can only load them to the sample section of the thing (it has an "s"  after the number for the sample number(001S)).. this all works fine and i can load the sample.. then when i try to put them into a bank for a pattern, i can only load them on drum part 1,3,5,6a,6b,7a,7b.. i can no longer put any type of sound on 2 and 4.. it makes no sense.. i thought i was low on memory so i deleted some stuff and same thing. i also tried to load from the card into the other areas of sample sounds and that wont work. if i load samples i already had in there it works normally. i cant figure it out.
i havent used this thing in a while, but i dont remember having problems loading samples from the card. i know i didnt cause i erased most of the factory sounds and replaced them this way.
it must be something in the loading process. i need to be able to load the samples into the normal section (like so it show a normal number without an s (001)

yes, i have the volume and pitch and all that stuff up..