Yeah the SYXG50 will do it's the same basic thing. I managed to make that run on a 166MMX with 32mb of RAM, so if your computer's only 2 months old I believe it will work.

(when I say "make that run", it would ONLY run that one thing and it caused more blue-screens-o-death than I can remember, but it was a really awful system, held together with tape and cable ties!)

You don't need any XG hardware, it's done entirely through software, and all your soundcard does is handle the actual midi data. I was impressed with what the SYXG50 could do, hopefully stuff will work out alright with you