I don't know what program you used to make this, but I have used "Modplug tracker" in the past. Pretty neat program, but the possibilities are limited because of the Midi structure (can't do any good reverb or anything of course, and the samples are really poor).
Since a few months, I'm using Cubase. You can make some really nice things with this program
Although it uses midi imput, you can use Real wav samples, which ofcourse makes all your songs sound loads better!
Good luck!
-Lennart