Soz, its a yamaha PSR-140 with only midi in & out headphones and mains plug on the back

theres a M-Audio MIDI interface cannecting it to my pc usb port,

the comp is a dell dimension 2300 standard SoundMax ADI Sound Card, 40Gb HD, 512Mb Ram, 2.4G Processor, updated graphics card & Harman/Kardon surround sound speakers with sub,

Is there any software or anyway to play the yamaha straight to the pc speakers

Does This Help? Thanks