If you already have your synth connected to your computer (midi in/out to midi out/in), all you should need is a sequencing package. Although I have never used a -demo-, it is my understanding that the demos are very limited and do not give you access to every parameter you need to have full sequencing capabilities...I may be wrong. I would suggest visiting your local major music store and trying out different "entry level" packages until you find the one that suits you. Cakewalk is one but ther are very many to choose from, some are less confusing than others and midi, at least initially, is confusing enough. Good luck.