ooh boy..you gonna get alot of "read the manuals" for this one..lol..you probably should though..it's located here
http://www7a.biglobe.ne.jp/%7Empc1000/version3e.htm anyway it's type vague and im bored as phuck, so..hell, lemme break it down for ya lol..this is easy..im assuming you already got your samples chopped..simply press mode + pad 7 and you'll be looking at your program..hit the cursor down once..then hit the pad you wanna assign your sound to..you'll see the numbers to the left change as you hit the pads..each number represents a different pad..once you've chosen the pad you wanna assign your sound to, use the data wheel to scroll through your loaded drums/chops, and wuala..good luck..