JersyDvl

I recently purchased a CTK - 2400 with the hopes of learning how to play. I tried using the keyboard with garageband, synthesia and logic on my mac but there seems to be about a half second of latency that is really throwing my timing off and I cannot seem to figure out how to resolve. I tried changing the buffering and it was no help. Any help would be very appreciated (im a total noob).