Get the free demo of fruity loops and download audacity recorder.
Put your tracks into fruity loops as a sample and then add your own samples,beats etc onto different tracks.
The fruity demo doesn't allow save or rendering of your work.
So then whilst fruity is still on,open audacity,click record from wave and then press your fruity play button and record it live.
If you have any creative sound blaster card you wont even need audacity as fruity has its own recorder software which is better than audacity as its directly programmed to operate with your exact soundcard