so you have all this experience from other synths and software and you can't figure out how to make a basic song on a synth comparable to what you have used already??? do you have a manuel??? have you even opened it up???
In "simple terms" make and loop a song however long you want your looped version of the song to be. next, get a watch and time how long your loop is and write it down. copy and paste all those parts for how long you want your song to be (assuming that you already figured out the time and length of the song on you own, copy paste, copy paste, copy paste, etc.) now that you have the full length of the song in front of you, instead of being in loop mode, now you can start erasing parts and working on the arrangement. this is how to make a song only on the fantom x. after you are done with all that hefty and tedious work, now guess what??? now you have to find a way to put it on cd...... good luck, have fun I hope....