Is MP3 the only format Fruity Loops will save in or will it save in MIDI for example? If it does you could save a midi version of your song and just move the samples from Fruity Loops to MODPlug Tracker. 
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<img align="right" src="http://webpages.charter.net/jazzjackrabbit/sig/El-ahrairah.PNG" height="200"><table bgcolor="navy"><td><font face="Trebuchet MS" size="3" color="blue"><i>"El-ahrairah, your people cannot rule the world, for I will not have it so. All the world will be your enemy, Prince with a Thousand Enemies, and whenever they catch you, they will kill you. But first they must catch you, digger, listener, runner, prince with the swift warning. Be cunning and full of tricks and your people shall never be destroyed."</i>
- The Blessing of El-ahrairah, Watership Down
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