Purchase a 3.5 mm-to-3.5 mm audio cable. These usually cost less than $5 and are available at electronics store.
Plug one end of the 3.5 mm cable into the computer's "Line In" port. Plug the other end of the cable into the computer's "Audio/Speaker Out" port.
Open Kinetic and Music Creator.
Set Music Creator in record mode so that it can capture the sounds coming from the "Line In" port. Load the music file to play (for export) in Kinetic.
Click "Record" in Music Creator and then quickly click "Play" in Kinetic. The audio output from Kinetic will be captured in Music Creator.
Stop the recording after it is finished and save the file in Music Creator.