Releasing Samples by pads problem

hi guys,

I have folder with 20 samples(snares) and when i want to hear them one by one to chose best i need to push play button then arrow key the again push button to hear...i saw in YT that people do this by pushin pads - 1 pad is first sample,2 pad is second sample in the folder etc ...how i can realse samples from hardrive by pads

for exemple patr00-BeatBlog vol. 1

http://www.youtube.com/watch?v=Rjdr6N4QQ-k

somebody can help me ?

sorry for my gramma