For some reason, when I export the mp3 of a project, it changes the tune of the ts404 synth and makes it out of tune with the rest of the song though it is in tune while playing the project file in fl. Does anyone know why it's doing this and how to fix it?

http://www.ehow.com/video_4949811_fruity-studio-tutorial_-ts404-waveforms.html
Try that,I really didnt go thought it so it might not work..You can type ts404 in Fruity loops also via you tube and see what happens,other key words are ts404 trouble shoot ts404 sound problem ,etc..See what comes up.Is your version a demo?I don't know the ts 404..Is it a dll or a installed vst?Try reinstalling if thats the case.Also try rendering in a pattern mode instead of song mode...Another thing is to open it up by it self in new project and dump something short on it and see if it still gives you the same issue,if not its a CPU issue.

Could be sample Rate, not sure though??