No Sounds. hELP MEEEEE!!!

I GOT A MPC1000 AND HAVE AN INTERFACE M-AUDIO FAST TRACK ULTRA... I HAVE MY SPEAKERS PLUGGED UP IN THE FIRST TWO OUTPUTS 1&2... I CAN ONLY PLUG UP MY SPEAKERS THERE AND I HAVE TO TURN UP THE MAIN OUTPUT SWITCH ON THE FRONT OF THE INTERFACE TO HEAR THE MUSIC FROM MY COMPUTER TO SPEAKERS.. AND I HOOKED UP MY MPC1000 TO THE INTERFACE. I LOADED UP MY SOUNDS AND ASSIGNED THEM TO PADS... BUT WHEN I HIT THE PADS I CANT HEAR NOTHING... I WENT TO MY FRIENDS HOUSE AND HE HOOKED IT UP TO HIS AND IT WORKED... CAN YOU TELL ME WHAT TO DO??? DO I NEED A DIFFERENT INTERFACE??? OR WHAT

did you route pads to appropriate outputs in the mixer view ?

What you mean im kind new to the mpc but if you talking about a regular mixer I dont have one or are uuuui talking about the mixer on the mpc mode