MIDI problems

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so i brought a yamaha ypt-400 and i have the cords and all that so i got the usb thing in the front and the power hooked up. yet i can only use the keyboard for a midi instrument and not get the actull sounds (instruments) from the keyboard onto my sony acid/fruit loops software. i really need help please give me some knowledge. you can check out my music at www.reverbnation.com/czheckproductions all songs free on there and check me out at www.myspace.com/czheckproductions